Professor Derek Sinclair
PhD, BSc, MRSRC
Department of Materials Science and Engineering
Professor in Materials Chemistry


+44 114 222 5974
Full contact details
Department of Materials Science and Engineering
Sir Robert Hadfield Building
Mappin Street
Sheffield
S1 3JD
- Profile
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Derek was appointed to the academic staff at the University of Sheffield in 1999 as a Lecturer in Functional Materials, following from Lecturer appointments in the Department of Chemistry, University of Aberdeen (1994-99) and the Department of Materials Science, University of Leeds (1993-94).
He obtained his BSc (1st Class Honours) and PhD (supervised by Professor Tony West) in Chemistry at the University of Aberdeen and held post-doctoral research appointments at the University of Aberdeen (with Profs Tony West and John Irvine) and the Interdisciplinary Research Centre for Superconductivity at the University of Cambridge (with Prof Paul Attfield), before joining the academic staff at Leeds in 1993.
Derek is recognised for his ability to probe the structure (crystal and defect)-composition-microstructure-property relationships of a wide range of functional oxides, spanning from superconductors to dielectrics via mixed conductors and solid electrolytes.
- Research interests
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Our research is involved with the synthesis and characterisation of oxide-based functional ceramics. The properties and applications of many functional ceramics depend on the close control of the crystal structure, composition, ceramic microstructure, dopants and dopant (or defect) distribution. Materials of well-defined composition are synthesised and characterised by a variety of diffraction, spectroscopic, microscopic, analytical and thermal techniques. The electrical properties are usually characterised by ac impedance spectroscopy, in preference to dc or conventional fixed-frequency measurements. This multi-technique approach is backed up with atomistic modelling (defect chemistry) and finite element modelling (electrical microstructure) to rationalise the composition-structure-property relationships in important functional ceramics which include dielectrics, solid electrolytes, mixed conductors and thermoelectrics.
In addition to systematic doping studies on established materials, we undertake explorative phase diagram studies and speculative synthetic work on `new´ materials with potentially useful electrical properties. This approach is being used to discover new mixed ionic/electronic conductors, proton conductors, oxide-ion conductors, piezo-, pyro- and ferro-electrics, (high permittivity) microwave dielectrics and thermoelectrics. Several of these projects are in collaboration with other MS&E staff members, including Tony West, Ian Reaney, John Harding, Colin Freeman and Julian Dean. We also collaborate with Rachael Elder and Ray Allen from Chemical & Biological Engineering on solid oxide electrolysis cells as part of an EPSRC Programme Grant on Carbon Capture and Utilisation (4CU).
Impedance spectroscopy is a powerful technique which is being developed to probe electrical inhomogeneities in ceramics, and in particular to study electrode/sample interfaces, surface layers, electro-active grain boundaries, core-shell phenomena within electrically heterogeneous grains, ferroelectricity and ionic conduction. Much of this work has been assisted by advanced data handling techniques, such as combined impedance and modulus spectroscopy, which has been developed in collaboration with Tony West. Recently we have developed a finite element code to simulate impedance spectroscopy data (with Julian Dean and John Harding) for three-dimensional ceramic microstructures which allows comprehensive treatment of a full three-dimensional granular representation of ceramic microstructure without the requirement for equivalent circuits based on the Brickwork layer model or the introduction of constant phase elements to describe any nonideality of the impedance response. A variety of electro-materials, commercial devices and porous materials have been characterised successfully including; solid state lithium batteries, positive temperature coefficient of resistance (ptcr)-BaTiO3 ceramics, single crystals of ferroelectric LiTaO3, numerous solid electrolytes, Bi4V2O11, La9.33(SiO4)6O2 and (Na,Bi)(Ti, Mg)O3, ferro-electric and Pb-free relaxors, BaTiO3-based Multi-Layer Capacitors (with AVX Ltd, Coleraine), Internal Barrier Layer Capacitors (CaCu3Ti4O12) and pore reduced cement.
Key projects:
- Ferroelectric BaTiO3-based ceramics for multilayer capacitors.
- High permittivity oxides for telecommunication applications, eg microwave dielectrics.
- Non-ohmic devices, eg ptcr-thermistors and Barrier Layer Capacitors.
- Low Temperature Co-fired Ceramics (LTCC).
- Pb-free piezoelectrics and recoverable electro-strain materials for actuators.
- Solid electrolytes and mixed conductors for sensors and solid oxide fuel/electrolysis cells.
- Thermoelectric oxides for thermoelectric generators.
- Development of Impedance Spectroscopy to characterise electroceramics.
- Publications
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Journal articles
- Pb, Bi, and rare earth free X6R barium titanate–sodium niobate ceramics for high voltage capacitor applications. Applied Physics Letters, 122(14), 143901-143901.
- Effects of processing strategies and La + Sm co-doping on the thermoelectric performance of A-site-deficient SrTiO3-δ ceramics. Crystals, 12(11).
- High discharge energy density in novel K1/2Bi1/2TiO3-BiFeO3 based relaxor ferroelectrics. Journal of the European Ceramic Society.
- Tuning the electrical conductivity of Rare Earth-doped BaTiO3 using Gd2O3 as an exemplar. Open Ceramics, 9.
- Dramatic impact of the TiO2 polymorph on the electrical properties of ‘stoichiometric’ Na0.5Bi0.5TiO3 ceramics prepared by solid-state reaction. Journal of Materials Chemistry A, 10(2), 891-901.
- Anomalous grain boundary conduction in BiScO3-BaTiO3 high temperature dielectrics. Acta Materialia, 216. View this article in WRRO
- High oxide-ion conductivity in acceptor-doped Bi-based perovskites at modest doping levels. Physical Chemistry Chemical Physics, 23(19), 11327-11333.
- The influence of Fe2O3 reagent grade purity on the electrical properties of ‘undoped’ LaFeO3 ceramics: a cautionary reminder. Journal of the European Ceramic Society. View this article in WRRO
- Resource efficient exploration of ternary phase space to develop multi-layer ceramic capacitors. Acta Materialia, 207, 116690-116690.
- Reducing dielectric loss in Na0.5Bi0.5TiO3 based high temperature capacitor material. Journal of the European Ceramic Society.
- Processing and properties of translucent bismuth sodium titanate ceramics. Journal of the European Ceramic Society. View this article in WRRO
- Non-ohmic conduction in sodium bismuth titanate : the influence of oxide-ion conduction. Physical Chemistry Chemical Physics, 22(36), 20941-20950.
- Origin of improved tunability and loss in N2 annealed barium strontium titanate films. Physical Review Materials, 4(9). View this article in WRRO
- Synthesis and characterization of a pyrochlore solid solution in the Na2O‐Bi2O3‐TiO2 system. Journal of the American Ceramic Society. View this article in WRRO
- Displacive order–disorder behavior and intrinsic clustering of lattice distortions in bi‐substituted NaNbO3. Advanced Functional Materials. View this article in WRRO
- Finite element modeling of resistive surface layers by micro‐contact impedance spectroscopy. Journal of the American Ceramic Society, 103(4), 2702-2714. View this article in WRRO
- Equivalent circuit parameter extraction of low-capacitance high-damping PTs. Electronics Letters. View this article in WRRO
- Decarbonising ceramic manufacturing : a techno-economic analysis of energy efficient sintering technologies in the functional materials sector. Journal of the European Ceramic Society, 39(16), 5213-5235. View this article in WRRO
- The analysis of impedance spectra for core–shell microstructures : why a multiformalism approach is essential. Advanced Functional Materials, 29(38). View this article in WRRO
- Origin of the large electrostrain in BiFeO3-BaTiO3 based lead-free ceramics. Journal of Materials Chemistry A. View this article in WRRO
- Predicting the energy storage density in poly(methyl methacrylate)/methyl ammonium lead iodide composites. Journal of Applied Physics, 125(21). View this article in WRRO
- High quality factor cold sintered Li2MoO4BaFe12O19 composites for microwave applications. Acta Materialia, 166, 202-207. View this article in WRRO
- Comparative environmental profile assessments of commercial and novel material structures for solid oxide fuel cells. Applied Energy, 235, 1300-1313. View this article in WRRO
- Ultrahigh energy storage density lead-free multilayers by controlled electrical homogeneity. Energy & Environmental Science. View this article in WRRO
- Modeling the Influence of Two Terminal Electrode Contact Geometry and Sample Dimensions in Electro-materials. Journal of the American Ceramic Society. View this article in WRRO
- High strain (0.4%) Bi(Mg2/3Nb1/3)O3‐BaTiO3‐BiFeO3 lead‐free piezoelectric ceramics and multilayers. Journal of the American Ceramic Society, 101(12), 5428-5442. View this article in WRRO
- Life cycle assessment and environmental profile evaluation of lead-free piezoelectrics in comparison with lead zirconate titanate. Journal of the European Ceramic Society, 38(15), 4922-4938. View this article in WRRO
- Stoichiometry-dependent local instability in MAPbI3 perovskite materials and devices. Journal of Materials Chemistry A. View this article in WRRO
- Electric field enhancement in ceramic capacitors due to interface amplitude roughness. Journal of the European Ceramic Society. View this article in WRRO
- Electrical conductivity and conduction mechanisms in (Na0.5Bi0.5TiO3)1-x(BiScO3)x (0.00 ≤ x ≤ 0.25) solid solutions. Journal of Materials Chemistry C. View this article in WRRO
- Use of the time constant related parameter fmax to calculate the activation energy of bulk conduction in ferroelectrics. Journal of Materials Chemistry C, 6(34), 9258-9268. View this article in WRRO
- p-Type/n-type behaviour and functional properties of KxNa(1-x)NbO3 (0.49 ≤ x ≤ 0.51) sintered in air and N2. Journal of the European Ceramic Society, 38(9), 3118-3126. View this article in WRRO
- The influence of excess K2O on the electrical properties of (K,Na)1/2Bi1/2TiO3 ceramics. Applied Physics Letters, 112(18). View this article in WRRO
- Finite element modeling on the effect of intra-granular porosity on the dielectric properties of BaTiO₃ MLCCs. Journal of the American Ceramic Society, 101(3), 1211-1220. View this article in WRRO
- Optimising dopants and properties in BiMeO3 (Me = Al, Ga, Sc, Y, Mg2/3Nb1/3, Zn2/3Nb1/3, Zn1/2Ti1/2) lead-free BaTiO3-BiFeO3 based ceramics for actuator applications. Journal of the European Ceramic Society, 38(12), 4220-4231. View this article in WRRO
- Review: Defect chemistry and electrical properties of sodium bismuth titanate perovskite. Journal of Materials Chemistry A. View this article in WRRO
- Optimisation of oxide-ion conductivity in acceptor-doped Na0.5Bi0.5TiO3 perovskite: approaching the limit?. Journal of Materials Chemistry A, 5(41), 21658-21662. View this article in WRRO
- Low-temperature co-sintering for fabrication of zirconia/ceria bi-layer electrolyte via tape casting using a Fe2O3 sintering aid. Journal of the European Ceramic Society, 37(13), 3981-3993. View this article in WRRO
- Mixed ionic-electronic conduction in K1/2Bi1/2TiO3. Journal of Materials Chemistry C, 5(25), 6300-6310. View this article in WRRO
- How to extract reliable core-volume fractions from core-shell polycrystalline microstructures using cross sectional TEM micrographs. Journal of the European Ceramic Society, 37(8), 2795-2801. View this article in WRRO
- Suppression of electrical conductivity and switching of conduction
mechanisms in ‘stoichiometric’ (Na0.5Bi0.5TiO3)1-x(BiAlO3)x (0 ≤ x ≤
0.08) solid solutions. Journal of Materials Chemistry C, 5(29), 7243-7252. View this article in WRRO
- Nanoscale Mapping of Bromide Segregation on the Cross Sections of Complex Hybrid Perovskite Photovoltaic Films Using Secondary Electron Hyperspectral Imaging in a Scanning Electron Microscope. ACS Omega, 2(5), 2126-2133. View this article in WRRO
- Are lead-free piezoelectrics more environmentally friendly?. MRS Communications, 1-7. View this article in WRRO
- Protocols for the Fabrication, Characterization, and Optimization of n-Type Thermoelectric Ceramic Oxides. Chemistry of Materials, 29(1), 265-280. View this article in WRRO
- Synthesis of Barium Titanate Using Deep Eutectic Solvents.. Inorg Chem, 56(1), 542-547. View this article in WRRO
- Temperature stable and fatigue resistant lead-free ceramics for actuators. Applied Physics Letters, 109(14). View this article in WRRO
- Enhanced bulk conductivity of A-site divalent acceptor-doped non-stoichiometric sodium bismuth titanate. Solid State Ionics. View this article in WRRO
- ChemInform Abstract: High Ionic Conductivity with Low Degradation in A-Site Strontium-Doped Nonstoichiometric Sodium Bismuth Titanate Perovskite.. ChemInform, 47(42).
- Design of a bilayer ceramic capacitor with low temperature coefficient of capacitance. Applied Physics Letters, 109. View this article in WRRO
- High Ionic Conductivity with Low Degradation in A Site Strontium-Doped Nonstoichiometric Sodium Bismuth Titanate Perovskite. Chemistry of Materials, 28(15), 5269-5273. View this article in WRRO
- Controlling mixed conductivity in Na 1/2 Bi 1/2 TiO 3 using A-site non-stoichiometry and Nb-donor doping. J. Mater. Chem. C, 4, 5779-5786. View this article in WRRO
- Development of the Oxide Ion Conductor Na0.5Bi0.5TiO3 (NBT) for Solid Oxide Cells. ECS Meeting Abstracts, MA2016-01(28), 1400-1400.
- High-Figure-of-Merit Thermoelectric La-Doped A-Site-Deficient SrTiO3 Ceramics. Chemistry of Materials, 28(3), 925-935. View this article in WRRO
- Phase transitions, domain structure, and pseudosymmetry in La- and Ti-doped BiFeO3. Journal of Applied Physics, 119(5), 054101-054101.
- A resource efficient design strategy to optimise the temperature coefficient of capacitance of BaTiO3-based ceramics using finite element modelling. Journal of Materials Chemistry A, 4(18), 6896-6901. View this article in WRRO
- The Influence of La Doping and Heterogeneity on the Thermoelectric Properties of Sr3
Ti2
O7
Ceramics. Journal of the American Ceramic Society, 99(2), 515-522. View this article in WRRO
- Electrochemical Impedance Spectroscopy Data from Solid Oxide Cells Undergoing Co-Electrolysis: The Influence of Rig Inductance. ECS Meeting Abstracts, MA2015-03(1), 316-316.
- Simulation of Impedance Spectra for Core-Shell Grain Structures Using Finite Element Modeling. Journal of the American Ceramic Society, 98(6), 1925-1931. View this article in WRRO
- Synthesis of a 12R-type hexagonal perovskite solid solution Sr3NdNb3-xTixO12-delta and the influence of acceptor doping on electrical properties. Dalton Transactions, 44(16), 7643-7653. View this article in WRRO
- Donor-doping and reduced leakage current in Nb-doped Na0.5Bi0.5TiO3. Applied Physics Letters, 106(10), 102904-102904. View this article in WRRO
- Dramatic Influence of A-Site Nonstoichiometry on the Electrical Conductivity and Conduction Mechanisms in the Perovskite Oxide Na0.5Bi0.5TiO3. Chemistry of Materials, 27(2), 629-634. View this article in WRRO
- Boriding kinetics and mechanical behaviour of AISI O1 steel. Surface Engineering, 31(8), 588-597.
- Structure–property relationships in (1−x)BaTiO3–xBiGdO3 ceramics. Journal of the European Ceramic Society, 35(9), 2479-2488.
- A-Site Strain and Displacement in Ba1–xCaxTiO3 and Ba1–xSrxTiO3 and the Consequences for the Curie Temperature. Chemistry of Materials, 26(21), 6104-6112. View this article in WRRO
- In-Situ Raman Spectroscopy Probing of Solid Oxide Electrolysis Cells. ECS Meeting Abstracts, MA2014-02(23), 1342-1342.
- Simulation of impedance spectra for a full three-dimensional ceramic microstructure using a finite element model. Journal of the American Ceramic Society, 97(3), 885-891. View this article in WRRO
- Impedance spectroscopy of (BiNa)TiO-BaTiO ceramics modified with (KNa)NbO. Journal of the American Ceramic Society.
- Impedance spectroscopy of (Bi1/2Na1/2)TiO3-BaTiO3 based high-temperature dielectrics. Journal of the American Ceramic Society.
- A family of oxide ion conductors based on the ferroelectric perovskite Na0.5Bi0.5TiO3.. Nat Mater, 13(1), 31-35. View this article in WRRO
- Additions and corrections for Journal of Materials Chemistry C published in 2013. Journal of Materials Chemistry C, 1(48), 8222-8222.
- In-Situ Monitoring of Solid Oxide Electrolysis Cells. ECS Meeting Abstracts, MA2013-02(10), 753-753.
- Energetics of donor-doping, metal vacancies, and oxygen-loss in A-site rare-earth-doped BaTiO
3 . Advanced Functional Materials, 23(31), 3925-3928. - Non-stoichiometry in "caCu
3 Ti4 O12 " (CCTO) ceramics. RSC Advances, 3(34), 14580-14589. View this article in WRRO - Transformation from insulating p-type to semiconducting n-type conduction in CaCu
3 Ti4 O12 -related Na(Cu5/2 Ti1/2 )Ti4 O12 ceramics. Journal of Applied Physics, 114(3). - Modulus spectroscopy of CaCu
3 Ti4 O12 ceramics: Clues to the internal barrier layer capacitance mechanism. RSC Advances, 3(19), 7030-7036. - Phase stabilisation of hexagonal barium titanate doped with transition metals: A computational study. Journal of Solid State Chemistry, 200, 310-316.
- ChemInform Abstract: Relaxor-Like Dielectric Behavior in Stoichiometric Sillenite Bi12SiO20.. ChemInform, 44(11), no-no.
- Direct atomic observation in powdered 4H-Ba
0.8 Sr0.2 Mn0.4 Fe0.6 O2.7 . Chemistry of Materials, 25(4), 548-554. 3 TI4 O12 (CCTO) ceramics for capacitor applications, 1-44.
CACU- The influence of a-site rare earth ion size in controlling the curie temperature of Ba
1-X REx Ti1-x/4 O3 . Advanced Functional Materials, 23(4), 491-495. - Ca K-edge X-ray absorption fine structure in BaTiO
3 -CaTiO3 solid solutions. Journal of Applied Physics, 113(4). - Relaxor-like dielectric behavior in stoichiometric sillenite Bi
12 SiO20 . Chemistry of Materials, 25(1), 48-54. - The application of a new potential model to the rare-earth doping of SrTiO3 and CaTiO3. JOURNAL OF MATERIALS CHEMISTRY C, 1(8), 1574-1582. View this article in WRRO
- ChemInform Abstract: Ba2Bi1.4Nb0.6O6: A Nonferroelectric, High Premittivity Oxide.. ChemInform, 43(41), no-no.
- First-principles study of intrinsic point defects in hexagonal barium titanate. JOURNAL OF APPLIED PHYSICS, 111(9).
- The extrinsic origins of high permittivity and its temperature and frequency dependence in Y
0.5 Ca0.5 MnO3 and La1.5 Sr0.5 NiO4 ceramics. Journal of Applied Physics, 111(5). - High temperature oxygen separation for the sulphur family of thermochemical cycles - Part II: Sulphur poisoning and membrane performance recovery. International Journal of Hydrogen Energy.
- Effects of sintering temperature on the internal barrier layer capacitor (IBLC) structure in CaCu
3 Ti4 O12 (CCTO) ceramics. Journal of the European Ceramic Society, 32(12), 3313-3323. - Ba
2 Bi1.4 Nb0.6 O6 : A nonferroelectric, high permittivity oxide. Chemistry of Materials, 24(12), 2247-2249. - Structure-property relations in anion deficient 5H- and 3C-polytype Ba(Ti,Co)O
3-δ perovskites. Journal of Materials Chemistry, 22(30), 15092-15103. - Defect chemistry of Ti-doped antiferroelectric Bi[sub 0.85]Nd[sub 0.15]FeO[sub 3]. Applied Physics Letters, 100(18).
- Structural phase transitions in Ti-doped Bi
1-x Ndx FeO3 ceramics. Journal of Applied Physics, 111(6). - Use of Raman spectroscopy to determine the site occupancy of dopants in BaTiO3. J APPL PHYS, 109(11).
- An atomistic study into the defect chemistry of hexagonal barium titanate. J APPL PHYS, 109(8).
- Extrinsic origins of the apparent relaxorlike behavior in CaCu3Ti4O12 ceramics at high temperatures: A cautionary tale. J APPL PHYS, 109(8).
- Anomalous Curie temperature behavior of A-site Gd-doped BaTiO3 ceramics: The influence of strain. APPL PHYS LETT, 98(9).
- Structure-Composition-Property Relationships of 6H-BaTi1-yCoyO3-delta (0.1 <= y <= 0.4). CHEM MATER, 23(4), 1050-1060.
- Nanoscale electrical probing of heterogeneous ceramics: the case of giant permittivity calcium copper titanate (CaCu3Ti4O12). NANOSCALE, 3(3), 1171-1175.
- The route to resource-efficient novel materials. Nature Materials, 10(12), 899-901.
- Ti-doping to reduce conductivity in Bi
0.85 Nd0.15 FeO3 ceramics. Advanced Functional Materials, 21(19), 3737-3743. - Ferroelectric, electrical, and structural properties of Dy and Sc co-doped BaTiO3. J MATER CHEM, 21(17), 6292-6299.
- A new potential model for barium titanate and its implications for rare-earth doping. J MATER CHEM, 21(13), 4861-4868.
- Influence of Nonstoichiometry on Extrinsic Electrical Conduction and Microwave Dielectric Loss of BaCo1/3Nb2/3O3 Ceramics. J AM CERAM SOC, 93(12), 4087-4095.
- Average and Local Structure of (1-x)BaTiO3-xLaYO(3) (0 <= x <= 0.50) Ceramics. J AM CERAM SOC, 93(12), 4174-4181.
- High temperature piezoelectric ceramics in the Bi(Mg1/2Ti1/2)O-3-BiFeO3-BiScO3-PbTiO3 system. J ELECTROCERAM, 25(2-4), 130-134.
- Field enhanced bulk conductivity of acceptor-doped BaTi1-xCaxO3-x ceramics. APPL PHYS LETT, 97(6).
- Polytypism in the BaMn0.85Ti0.15O3-delta System (0.07 <=delta <= 0.34). Structural, Magnetic, and Electrical Characterization of the 9R-Polymorph. CHEM MATER, 22(14), 4320-4327.
- Effects of average and local structure on the dielectric behavior of (1-x)BaTiO3-xLaYO(3) (0 <= x <= 0.40) ceramics. J APPL PHYS, 108(1).
- Soft-mode behavior and incipient ferroelectricity in Na1/2Bi1/2Cu3Ti4O12. PHYS REV B, 81(22).
- A link between p-type electrical conduction and microwave dielectric loss in highly ordered Ba(Co1/3Nb2/3)O-3 ceramics. J MATER RES, 25(6), 1011-1014.
- Anomalous Increase of Dielectric Permittivity in Sr-Doped CCTO Ceramics Ca1-xSrxCu3Ti4O12 (0 <= x <= 0. 2). CHEM MATER, 22(1), 6-8.
- Formation of (Ti′
Ti - V••O )• defect dipoles in BaTiO3 ceramics heat-treated under reduced oxygen partial-pressure. Functional Materials Letters, 3(1), 65-68. - Polar order and diffuse scatter in Ba(Ti1-xZrx)O-3 ceramics. J APPL PHYS, 106(11).
- Origin(s) of the apparent high permittivity in CaCu3Ti4O12 ceramics: clarification on the contributions from internal barrier layer capacitor and sample-electrode contact effects. J APPL PHYS, 106(10).
- Mn-Rich BaMn1-xFexO3-delta Perovskites Revisited: Structural, Magnetic, and Electrical Properties of Two New 6H ' Polytypes. CHEM MATER, 21(21), 5272-5283.
- Investigation of high Curie temperature (1-x)BiSc1-yFeyO3-xPbTiO3 piezoelectric ceramics. J APPL PHYS, 106(8).
- Direct imaging of the core-shell effect in positive temperature coefficient of resistance-BaTiO3 ceramics. APPL PHYS LETT, 95(14).
- Relaxor ferroelectric-like high effective permittivity in leaky dielectrics/oxide semiconductors induced by electrode effects: A case study of CuO ceramics. J APPL PHYS, 105(11).
- Robust Antiferromagnetism and Structural Disorder in BixCa1-xFeO3 Perovskites. CHEM MATER, 21(10), 2085-2093.
- Possible incipient ferroelectricity in Mn-doped Na1/2Bi1/2Cu3Ti4O12. APPL PHYS LETT, 94(21).
- Influence of octahedral tilting on the microwave dielectric properties of A(3)LaNb(3)O(12) hexagonal perovskites (A=Ba, Sr). APPL PHYS LETT, 94(19).
- Composition-Structure-Property Relationships of 6H-and 12R-Type Hexagonal Ba(Mn,Ti)O3-delta Perovskites. CHEM MATER, 21(8), 1731-1742.
- Dielectric properties of ACu
3 Ti4 O12 -type perovskites. Ceramic Transactions, 204, 145-153. - Comment on the origin(s) of the giant permittivity effect in CaCu3Ti4O12 single crystals and ceramics. J MATER CHEM, 19(33), 5916-5919.
- Synthesis, structure and properties of the hexagonal perovskite, h-BaTi1-xHoxO3-x/2. J MATER CHEM, 19(29), 5201-5206.
- The influence of nanometric phase separation on the dielectric and magnetic properties of (1-x)BaTiO3-xLaYbO(3) (0 <= x <= 0.60) ceramics. J MATER CHEM, 19(3), 356-359.
- Ferroelectric aging and recoverable electrostrain in BaTi0.98Ca0.02O2.98 ceramics. J AM CERAM SOC, 91(9), 3101-3104.
- Localized electrical characterization of the giant permittivity effect in CaCu3Ti4O12 ceramics. APPL PHYS LETT, 92(18).
- Study of the structural, magnetic, and electrical properties of the 5H hexagonal-type perovskite BaMn0.2Co0.8O2.80. CHEM MATER, 20(8), 2818-2828.
- Microwave dielectric properties of low firing temperature Bi2W2O9 ceramics. J AM CERAM SOC, 91(4), 1338-1341.
- Crystal structure and microwave dielectric properties of alkaline-earth hafnates, AHfO(3) (A = Ba, Sr, Ca). J AM CERAM SOC, 91(3), 893-901.
- ChemInform Abstract: A Pure Bismuth A Site Polar Perovskite Synthesized at Ambient Pressure.. ChemInform, 39(8).
3 Ti4 O12 dielectric properties: The role of surface defects. Solid State Phenomena, 131-133, 443-448.
Nanoscale imaging of CaCu- Polymorphism and dielectric properties of nb-doped BaTiO3. J AM CERAM SOC, 91(1), 144-150.
- A Pure Bismuth A Site Polar Perovskite Synthesized at Ambient Pressure. Angewandte Chemie, 119(46), 8941-8945.
- Crystallization and dielectric properties of borate-based ferroelectric PbTiO3 glass-ceramics. J ELECTROCERAM, 19(2-3), 221-228.
- Incipient ferroelectricity and microwave dielectric resonance properties of CaCu2.85Mn0.15Ti4O12 ceramics. APPL PHYS LETT, 91(13).
- In situ Raman spectroscopy of A-site doped barium titanate. APPL PHYS LETT, 91(6).
- Structure-property relationships of the 10H hexagonal-type perovskite BaMn0.4Fe0.6O2.73. CHEM MATER, 19(14), 3425-3432.
- Crystal structure and dielectric properties of LaYbO3. J AM CERAM SOC, 90(5), 1475-1482.
- Comment on the use of calcium as a dopant in X8R BaTiO3-based ceramics. APPL PHYS LETT, 90(14).
- Characterization of Ba0.9Sr0.1TiO3 prepared by low temperature chloride aqueous synthesis. Journal of Materials Science, 42(7), 2492-2498.
- Engineered sintering aids for PbO-based electroceramics. J ELECTROCERAM, 18(1-2), 77-85.
- Structural and electrical characterization of CeAlO3 ceramics. J APPL PHYS, 101(6).
- Electrical conductivity of hexagonal Ba(Ti
0.90 Mn0.10 )O3 ceramics. Proceedings of the 2nd IEEE International Conference on Nano/Micro Engineered and Molecular Systems, IEEE NEMS 2007, 947-950. - Influence of attrition milling on the electrical properties of undoped-BaTiO3. J EUR CERAM SOC, 27(7), 2577-2589.
- A pure bismuth a site polar perovskite synthesized at ambient pressure.. Angew Chem Int Ed Engl, 46(46), 8785-8789.
- Enhanced oxide ion conductivity in stabilized delta-Bi2O3. J AM CHEM SOC, 128(48), 15386-15387.
- High intrinsic permittivity in Na1/2Bi1/2Cu3Ti4O12. APPL PHYS LETT, 89(21).
- Influence of processing conditions on the electrical properties of CaCu3Ti4O12 ceramics. J AM CERAM SOC, 89(10), 3129-3135.
- Structure and microwave dielectric properties of Ca1-xYxTi1-xAlxO3 (CYTA) ceramics (vol 20, pg 2391, 2005). J MATER RES, 21(9), 2429-2429.
- Decomposition reactions in CaCu3Ti4O12 ceramics. J AM CERAM SOC, 89(9), 2833-2838.
- Influence of Mn doping on the semiconducting properties of CaCu3Ti4O12 ceramics. APPL PHYS LETT, 88(23).
- Synthesis and characterization of BaTi1-xGaxO3-delta (0 <= x <= 0.15) ceramics. J AM CERAM SOC, 89(7), 2105-2113.
- Characterization of grain boundary impedances in fine- and coarse-grained CaCu3Ti4O12 ceramics. PHYS REV B, 73(9).
- Synthesis and electrical properties of Nb-doped BaTiO3. J MATER CHEM, 16(30), 3114-3119.
- Microwave dielectric properties of hexagonal 12R-Ba3LaNb3O12 ceramics. J AM CERAM SOC, 89(1), 332-335.
- Dielectric properties of the "twinned" 8H-hexagonal perovskite Ba8Nb4Ti3O24. J AM CERAM SOC, 89(1), 336-339.
- EELS characterisation of bulk CaCu3Ti4O12 ceramics.. Micron, 37(5), 412-419.
- High-temperature (1-x)BiSc1/2Fe1/2O3-xPbTiO(3) piezoelectric ceramics. APPL PHYS LETT, 87(24).
- Oxygen loss, semiconductivity, and positive temperature coefficient of resistance behavior in undoped cation-stoichiometric BaTiO3 ceramics. J APPL PHYS, 98(9).
- Structure-property relationships of BaTi1-2yGayNbyO3 (0 <= y <= 0.35) ceramics. J AM CERAM SOC, 88(11), 3055-3062.
- Origin of the high permittivity in (La0.4Ba0.4Ca0.2)(Mn0.4Ti0.6)O-3 ceramics. J APPL PHYS, 98(8).
- Structure and microwave dielectric properties of Ca1-xYxTi1-xAlxO3 (CYTA) ceramics. J MATER RES, 20(9), 2391-2399.
- Synthesis and characterisation of lanthanum germanate-based apatite phases. SOLID STATE IONICS, 176(23-24), 1941-1947.
- Lead titanate glass-ceramics derived from a silicate-based melt. J MATER RES, 20(5), 1316-1323.
- Synthesis and characterisation of bismuth phosphate-based sillenites. SOLID STATE IONICS, 176(3-4), 393-400.
- Electrical properties of Mg-doped LiTaO3 ceramics. Materials Research Bulletin, 39(14-15), 2229-2240.
- Synthesis and ionic conductivity of PbBi6M2O15 (M=V, P, As) and SrBi6V2O15 solid solutions. SOLID STATE IONICS, 171(3-4), 237-242.
- Synthesis, Crystal Structure, and Characterization of Ba(Ti1/2Mn1/2)O3: A High Permittivity 12R-Type Hexagonal Perovskite.. ChemInform, 35(30).
- Electrical conductivity of hexagonal Ba(Ti0.94Ga0.06)O-2.97 ceramics. J EUR CERAM SOC, 23(11), 1911-1917.
- Microwave Dielectric Properties of Gallium-Doped Hexagonal Barium Titanate Ceramics.. ChemInform, 34(27).
- Ba8ZnTa6O24: a high-Q microwave dielectric from a potentially diverse homologous series. APPL PHYS LETT, 82(25), 4537-4539.
- CaCu3Ti4O12: One-step internal barrier layer capacitor. APPL PHYS LETT, 80(12), 2153-2155.
- Synthesis and characterisation of La0·95Sr0·05GaO3−δ, La0·95Sr0·05AlO3−δ and Y0·95Sr0·05AlO3−δ. Journal of the European Ceramic Society, 19(8), 1665-1673.
- Densification and conductivity enhancement of Na4Zr2Si3O12-based solid electrolytes using TiO2 as a sintering aid. Solid State Ionics, 120(1-4), 33-41.
- Ionic and electronic conduction in La0.95Sr0.05GaO3−δ, La0.95Sr0.05AlO3−δ and Y0.95Sr0.05AlO3−δ. Solid State Ionics, 118(3-4), 229-239.
- . Journal of Materials Science, 34(5), 917-924.
- Hydrothermal synthesis and characterisation of BaTiO3 fine powders: precursors, polymorphism and properties. Journal of Materials Chemistry, 9(1), 83-91.
- An AC impedance spectroscopy study of hydrated cement pastes. Advances in Cement Research, 10(4), 151-159.
- NaBi3V2O10: a new oxide ion conductor. Journal of Materials Chemistry, 8(2), 281-282.
- . Journal of Materials Science Letters, 17(3), 203-205.
- Development of an Equivalent Circuit Model for Cement Pastes from Microstructural Considerations. Journal of the American Ceramic Society, 80(11), 2876-2884.
- . Journal of Materials Science Letters, 16(6), 422-425.
- Synthesis, phase stability and electrical characterisation of BINAVOX solid solutions. Journal of Materials Chemistry, 7(10), 2091-2095.
- . Journal of Electroceramics, 1(1), 65-71.
- Electrical properties of Cu2P3I2. Materials Research Bulletin, 31(2), 171-176.
- Optimization of superconducting critical temperatures by control of cation and anion stoichiometry in Bi2Sr2CaCu2Oδ-based solid solutions. Journal of Materials Science, 30(11), 2743-2746.
- Use of Succinic Acid to Test the Stability of PTCR Barium Titanate Ceramics under Reducing Conditions. Journal of the American Ceramic Society, 78(1), 241-244.
- Thermoelectric power of the single layer compound Bi2.1Sr1.9CuO6+δ. Physica C: Superconductivity, 235-240, 1531-1532.
- Discontinuity in the magnetization of single crystal Tl2Ba2CuO6+∂ with Hab. Physica C: Superconductivity, 235-240, 2711-2712.
- Powder diffraction studies of a 118 K Tl,Pb-1223 superconductor. Physica C: Superconductivity, 235-240, 967-968.
- Field dependence of the resistive transition in Tl2Ba2CuO6+δ. Physica C: Superconductivity, 235-240, 1927-1928.
- The resistive upper critical field of the cuprate superconductors. Physica C: Superconductivity, 235-240, 233-236.
- Phase separation and cation distributions in Tl-2201 from resonant synchrotron X-ray diffraction. Physica C: Superconductivity, 235-240, 965-966.
- Cation distribution and composition of the Tl-2223 superconductor from combined powder neutron and resonant X-ray diffraction. Physica C: Superconductivity, 225(3-4), 307-316.
- Resistive upper critical field of single crystals of Tl2Ba2CuO6. Journal of Superconductivity, 7(2), 271-277.
- Cation distribution in the superconducting Tl, Pb-1223 phase (“Tl0.5Pb0.5Sr2Ca2Cu3O9”) from resonant synchrotron powder X-ray diffraction. Physica C: Superconductivity, 221(3-4), 304-310.
- Effect of atmosphere on the PTCR properties of BaTiO3 ceramics. Journal of Materials Science, 29(23), 6061-6068.
- Electrical characterisation of bismuth orthovanadate using ac impedance spectroscopy. Solid State Ionics, 66(1-2), 151-158.
- Stoichiometry and stability of bismuth vanadate, Bi4V2O11, solid solutions. Solid State Ionics, 62(3-4), 193-198.
- Superconductivity in La-doped Bi “2201”. Physica C: Superconductivity, 205(3-4), 323-328.
- Stoichiometry and kinetics of formation of Bi2Sr2CaCu2O? solid solutions. Journal of Materials Chemistry, 2(5), 579-579.
- Characterization of Pb- and Ca-doped Bi2+xSr2−xCuO6+δ. Journal of Materials Research, 7(1), 43-47.
- Characterisation of Incommensurate Bi2+xSr2-xCuOzby X-Ray Powder Diffraction and Oxygen Content Determinations. Japanese Journal of Applied Physics, 29(Part 2, No. 11), L2002-L2005.
- Electroceramics: Characterization by Impedance Spectroscopy. Advanced Materials, 2(3), 132-138.
- Use of blocking In/Ga electrodes for conductivity measurements. Solid State Ionics, 37(4), 295-298.
- Impedance and modulus spectroscopy of semiconducting BaTiO3showing positive temperature coefficient of resistance. Journal of Applied Physics, 66(8), 3850-3856.
- BulkPTC effect on doped BaTiO3. Journal of Materials Science Letters, 7(8), 823-824.
- A.C. impedance studies of the lithium/polymer electrolyte interface in solid-state lithium cells. Journal of Power Sources, 24(2), 157-164.
- Aqueous Cold Sintering of Li-Based Compounds. ACS Applied Materials & Interfaces.
- Electrical and Dielectric Properties of Ca-Doped Bi-Deficient Sodium Bismuth Titanate Na0.5Bi0.49−xCaxTiO3−δ (0 ≤ x ≤ 0.08). Crystals, 12(12), 1800-1800.
- Comparison of BSPT and PZT Piezoelectric Ceramic Transformers for High Temperature Power Supplies. Advanced Engineering Materials.
- Themed issue on advances in solid state chemistry and its applications. Journal of Materials Chemistry A, 6(13), 5241-5242.
- Oxygen-loss in A-site deficient Sr0.85La0.10TiO3 perovskite. RSC Adv., 4(61), 32549-32554.
- ChemInform Abstract: Giant Barrier Layer Capacitance Effects in CaCu3Ti4O12 Ceramics.. ChemInform, 33(51), no-no.
- Novel Doping Mechanism for Very-High-Permittivity Barium Titanate Ceramics. Journal of the American Ceramic Society, 81(7), 1957-1960.
- Classification of the interlayer coupling in high-Tccuprates from low-field magnetization studies. Physical Review B, 53(10), 6752-6758.
- Normal-state magnetotransport in superconductingTl2Ba2CuO6+δto millikelvin temperatures. Physical Review B, 53(9), 5848-5855.
- Cation distributions and possible phase separation inTl2Ba2CuO6+δfrom synchrotron powder x-ray diffraction. Physical Review B, 51(18), 12747-12753.
- Discontinuity in the low-field magnetization of single-crystalTl2Ba2CuO6withH‖‖ab. Physical Review B, 50(17), 13073-13076.
- Field dependence of the resistive transition inTl2Ba2CuO6+δ. Physical Review B, 49(18), 13243-13246.
- Synthesis and crystal structure of Li2NaTa7O19. J. Mater. Chem., 4(3), 445-447.
- Resistive upper critical field ofTl2Ba2CuO6at low temperatures and high magnetic fields. Physical Review Letters, 71(8), 1238-1241.
- Characterization of Ca-doped Bi2 +xSr2 –xCuOz. J. Mater. Chem., 1(1), 147-148.
- Electrical properties of aLiTaO3single crystal. Physical Review B, 39(18), 13486-13492.
- Using metadynamics to obtain the free energy landscape
for cation diffusion in functional ceramics : dopant
distribution control in rare earth-doped BaTiO3. Advanced Functional Materials. View this article in WRRO
- Fatigue resistant lead-free multilayer ceramic capacitors with ultrahigh energy density. Journal of Materials Chemistry A. View this article in WRRO
- Superior energy density through tailored dopant strategies in multilayer ceramic capacitors. Energy & Environmental Science.
- View this article in WRRO
- From insulator to oxide-ion conductor by a synergistic effect from defect chemistry and microstructure: acceptor-doped Bi-excess sodium bismuth titanate Na0.5Bi0.51TiO3.015. Journal of Materials Chemistry A, 8(47), 25120-25130.
Chapters
Conference proceedings papers
- La and Sm Co-doped SrTiO3-delta Thermoelectric Ceramics. Materials Today: Proceedings, Vol. 4(12) (pp 12360-12367) View this article in WRRO
- Electrochemical Impedance Spectroscopy Data from Solid Oxide Cells Undergoing Co-Electrolysis: The Influence of Rig Inductance. ECS Transactions, Vol. 68(1) (pp 3417-3427)
- Methodology for Analysis of Solid Oxide Cells via Raman Spectroscopy. ECS Transactions, Vol. 68(1) (pp 2083-2092)
- In-situ Monitoring of Solid Oxide Electrolysis Cells. ELECTROCHEMICAL SYNTHESIS OF FUELS 2, Vol. 58(2) (pp 207-216)
- Microwave dielectric properties of Na1/2Bi1/2Cu2.82Mn0.18Ti4O12 ceramics. 3RD INTERNATIONAL CONGRESS ON CERAMICS (ICC3): ADVANCES IN ELECTRO CERAMICS, Vol. 18
- Detection of heterogeneities in single-crystal CaCu3Ti4O12using conductive atomic force microscopy. IOP Conference Series: Materials Science and Engineering, Vol. 8 (pp 012018-012018)
- Probing dielectric ceramics surface at sub-micrometer scale. IOP Conference Series: Materials Science and Engineering, Vol. 8 (pp 012038-012038)
- Probing heterogeneity in ptcr-BaTiO3thermistors by local probe electrical measurements. IOP Conference Series: Materials Science and Engineering, Vol. 8 (pp 012037-012037)
- Phase and morphology investigation of BaxSr1-xTiO3 (x=0.6, 0.7 and 0.8) powders. CURRENT APPLIED PHYSICS, Vol. 6(3) (pp 474-477)
- Synthesis and characterisation of La0.4Ba0.6Ti0.6RE0.4O3 (where RE = Y, Yb) ceramics. JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, Vol. 26(10-11) (pp 1947-1951)
- Characterisation of grain boundaries in CaCu3Ti4O12 using HREM, EDS and EELS.. EMAG-NANO 2005: Imaging, Analysis and Fabrication on the Nanoscale, Vol. 26 (pp 65-68)
- Synthesis and characterisation of doped 6H-BaTiO3 ceramics. JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, Vol. 24(6) (pp 1721-1724)
- Novel high capacitance materials: BaTiO3 : La and CaCu3Ti4O12. JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, Vol. 24(6) (pp 1439-1448)
- SYNTHESIS AND IONIC CONDUCTIVITY OF PbBi6M2O15(M = V, P, As) AND Pb1-xSrxBi6V2O15 SOLID SOLUTIONS. Solid State Ionics
- PREPARATION AND CHARACTERIZATION OF IONIC CONDUCTOR Bi23V4O44.5. Solid State Ionics
- Synthesis and characterisation of Ga-doped hexagonal BaTiO3. CRYSTAL ENGINEERING, Vol. 5(3-4) (pp 439-448)
- Impedance Spectroscopy of Undoped BaTiO3 Ceramics. Journal of the American Ceramic Society, Vol. 79(6) (pp 1633-1641)
- Nanoscale Imaging of CaCu3Ti4O12 Dielectric Properties: The Role of Surface Defects. Solid State Phenomena, Vol. 131-133 (pp 443-448)
Other
- ChemInform Abstract: Synthesis, Structure and Electrical Properties of Cu3.21Ti1.16Nb2.63O12 and the CuOx-TiO2-Nb2O5 Pseudoternary Phase Diagram.. ChemInform, 42(42), no-no.
Preprints
- Pb, Bi, and rare earth free X6R barium titanate–sodium niobate ceramics for high voltage capacitor applications. Applied Physics Letters, 122(14), 143901-143901.
- Professional activities and memberships
-
- Member of the EPSRC Peer Review College (Functional Materials).
- Member of the IOM3 Materials Chemistry Committee.
- Editorial Board Member for the Journal of Asian Ceramic Societies.