Derek C. Sinclair
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View article: The role of chemical, polar and octahedral tilt disorder in high voltage/energy density ceramics
The role of chemical, polar and octahedral tilt disorder in high voltage/energy density ceramics Open
Power modules in electric vehicles (EVs) are essential electronic components that manage and convert electrical power between the battery and other vehicle systems, such as the motor. The electronics are required to operate at higher tempe…
View article: Aqueous cold-sintering of Na0.7CoO2: A benign, facile method for the densification of Na-ion compounds
Aqueous cold-sintering of Na0.7CoO2: A benign, facile method for the densification of Na-ion compounds Open
The properties of the hexagonal P2 sodium cobaltate, Na0.7CoO2 (NCO) phase densified using the conventional and cold sintering methods were investigated, and we demonstrated that the cold sintering method yields NCO with a relative density…
View article: Application of Johnson's approximation in finite element modeling for electric field‐dependent materials
Application of Johnson's approximation in finite element modeling for electric field‐dependent materials Open
Johnson's approximation is implemented in a finite element code to simulate the electric field dependence of a core–shell microstructure material. We show how the microstructure, based here on a 50:50 volume fraction, influences the measur…
View article: Lead‐Free High Permittivity Quasi‐Linear Dielectrics for Giant Energy Storage Multilayer Ceramic Capacitors with Broad Temperature Stability
Lead‐Free High Permittivity Quasi‐Linear Dielectrics for Giant Energy Storage Multilayer Ceramic Capacitors with Broad Temperature Stability Open
Electrostatic energy storage capacitors are essential passive components for power electronics and prioritize dielectric ceramics over polymer counterparts due to their potential to operate more reliably at > 100 ˚C. Most work has focused …
View article: Effect of ZrO2 stoichiometry on the structural and electrical properties of Na3Zr2−xSi2PO12-2x solid electrolyte
Effect of ZrO2 stoichiometry on the structural and electrical properties of Na3Zr2−xSi2PO12-2x solid electrolyte Open
Na3Zr2Si2P2O12 (NZSP) has potential use as a solid electrolyte in Na-ion solid-state batteries due to its high ionic conductivity (10-3–10-4 Scm-1) at room temperature. It is established that all previous preparations involving the solid-s…
View article: Investigation of using BSPT for ring-dot piezoelectric transformers for use in high-temperature resonant power supplies
Investigation of using BSPT for ring-dot piezoelectric transformers for use in high-temperature resonant power supplies Open
SiC and GaN devices are gaining in popularity in both research and commercial applications. One of the many benefits of these devices is the possibility of power converter operation at temperatures in excess of that possible with Si-based …
View article: Impedance and Dielectric Spectroscopy of Functional Materials: A Critical Evaluation of the Two Techniques
Impedance and Dielectric Spectroscopy of Functional Materials: A Critical Evaluation of the Two Techniques Open
Impedance and dielectric spectroscopies are closely related techniques for measuring the electrical properties of materials. The techniques differ in two ways. First, impedance measurements are usually made over several decades of frequenc…
View article: Techno-environmental analysis of material substitution in thermoelectric modules: non-oxide (bismuth telluride alloys) vs. oxide-based (lanthanum-doped strontium titanate and calcium cobaltite) materials
Techno-environmental analysis of material substitution in thermoelectric modules: non-oxide (bismuth telluride alloys) vs. oxide-based (lanthanum-doped strontium titanate and calcium cobaltite) materials Open
Due to high toxicity, thermal instability at high temperature, low availability, and the high cost of raw metallic alloys such as Bi2Te3 for thermoelectric (TE) applications, there has been a drive to develop earth-abundant and eco-benign …
View article: Aqueous Cold Sintering of Li-Based Compounds
Aqueous Cold Sintering of Li-Based Compounds Open
Aqueous cold sintering of two lithium-based compounds, the electrolyte Li6.25La3Zr2Al0.25O12 (LLZAO) and cathode material LiCoO2 (LCO), is reported. For LLZAO, a relative density of ∼87% was achieved, whereas LCO was sintered to ∼95% with …
View article: Pb, Bi, and rare earth free X6R barium titanate–sodium niobate ceramics for high voltage capacitor applications
Pb, Bi, and rare earth free X6R barium titanate–sodium niobate ceramics for high voltage capacitor applications Open
0.9Ba(Ti1−xMgx)O3−x-0.1NaNbO3 (BTNN-100xMg) solid solutions are investigated with a view to developing Bi, Pb, and rare earth free, high voltage multilayer ceramic capacitors. Mg doping on the B-site significantly reduced the electronic co…
View article: A finite element study on the influence of surface cracks on micro-contact impedance spectroscopy measurements
A finite element study on the influence of surface cracks on micro-contact impedance spectroscopy measurements Open
Micro-contact impedance spectroscopy (MCIS) is a powerful tool to analyse local features of interest in electroceramics. The surface condition of the measured area of interest however may not always be ideal. Surface defects such as cracks…
View article: Dynamic tilting in perovskites
Dynamic tilting in perovskites Open
A new computational analysis of tilt behaviour in perovskites is presented. This includes the development of a computational program – PALAMEDES – to extract tilt angles and the tilt phase from molecular dynamics simulations. The results a…
View article: Understanding the structure-dielectric property relationships of (Ba0.8Ca0.2)TiO3-Bi(Mg0.5Ti0.5)O3 perovskites
Understanding the structure-dielectric property relationships of (Ba0.8Ca0.2)TiO3-Bi(Mg0.5Ti0.5)O3 perovskites Open
Atomic-level simulations are used to examine the structure, thermodynamics, and dielectric properties of (Ba0.8Ca0.2)TiO3-Bi(Mg0.5Ti0.5)O3 perovskites. These simulations demonstrate that mixing is non-ideal between the end-members, and onl…
View article: Electrical and Dielectric Properties of Ca-Doped Bi-Deficient Sodium Bismuth Titanate Na0.5Bi0.49−xCaxTiO3−δ (0 ≤ x ≤ 0.08)
Electrical and Dielectric Properties of Ca-Doped Bi-Deficient Sodium Bismuth Titanate Na0.5Bi0.49−xCaxTiO3−δ (0 ≤ x ≤ 0.08) Open
Bismuth-deficient sodium bismuth titanate (nominal Na0.5Bi0.49TiO2.985, NB0.49T) presents high oxide ion conductivity, which makes it a potential electrolyte material for intermediate-temperature solid oxide fuel cells. Acceptor doping has…
View article: Effects of Processing Strategies and La + Sm Co-Doping on the Thermoelectric Performance of A-Site-Deficient SrTiO3-δ Ceramics
Effects of Processing Strategies and La + Sm Co-Doping on the Thermoelectric Performance of A-Site-Deficient SrTiO3-δ Ceramics Open
The effect of calcining in either air (VSTO-A) or 5% H2/N2 (VSTO-H) on the thermoelectric performance of La and Sm co-doped A-site-deficient Sr1-3x/2Lax/2Smx/2TiO3-δ ceramics is reported. All calcined powders were sintered 6 h in 5% H2/N2 …
View article: Comparison of BSPT and PZT Piezoelectric Ceramic Transformers for High‐Temperature Power Supplies
Comparison of BSPT and PZT Piezoelectric Ceramic Transformers for High‐Temperature Power Supplies Open
High‐temperature power electronics is an advancing area of research, especially given the widespread availability of wide bandgap semiconductors. Herein, a suitability analysis of (1− x )BiScO 3 − x PbTiO 3 (BSPT) as a material for high‐te…
View article: High discharge energy density in novel K1/2Bi1/2TiO3-BiFeO3 based relaxor ferroelectrics
High discharge energy density in novel K1/2Bi1/2TiO3-BiFeO3 based relaxor ferroelectrics Open
An increasing number of new dielectrics are being reported for the development of next-generation ceramic capacitors for power electronics used in clean energy technologies. Here, high discharge energy density (Wdis) ~6.1 J cm−3 with effic…
View article: Tuning the electrical conductivity of Rare Earth-doped BaTiO3 using Gd2O3 as an exemplar
Tuning the electrical conductivity of Rare Earth-doped BaTiO3 using Gd2O3 as an exemplar Open
The electrical properties of Gd-doped BaTiO3 ceramics prepared by various doping mechanisms have been investigated using Impedance Spectroscopy and correlated with the proposed doping mechanisms observed from phase diagram studies and with…
View article: Dramatic impact of the TiO<sub>2</sub> polymorph on the electrical properties of ‘stoichiometric’ Na<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub> ceramics prepared by solid-state reaction
Dramatic impact of the TiO<sub>2</sub> polymorph on the electrical properties of ‘stoichiometric’ Na<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub> ceramics prepared by solid-state reaction Open
The TiO 2 polymorph has a dramatic impact on the electrical conductivity and conduction mechanisms of nominally stoichiometric NBT ceramics prepared by solid-state reaction.
View article: High oxide-ion conductivity in acceptor-doped Bi-based perovskites at modest doping levels
High oxide-ion conductivity in acceptor-doped Bi-based perovskites at modest doping levels Open
High oxide ion conductivity is achieved in A-site alkaline earth doped BiFeO3 at modest levels. The similar levels of conductivity suggest oxide–ion conduction in Bi-based tilted perovskites is beyond a simple radius-based crystallochemica…
View article: Synthesis and characterization of a pyrochlore solid solution in the Na <sub>2</sub> O‐Bi <sub>2</sub> O <sub>3</sub> ‐TiO <sub>2</sub> system
Synthesis and characterization of a pyrochlore solid solution in the Na <sub>2</sub> O‐Bi <sub>2</sub> O <sub>3</sub> ‐TiO <sub>2</sub> system Open
The compositional limits of a previously reported (J. Am. Ceram. Soc., 61, 5‐8. (1978)) but relatively unstudied sodium‐bismuth titanate pyrochlore solid solution are revised and their electrical properties presented. The pyrochlore solid …
View article: Equivalent circuit parameter extraction of low‐capacitance high‐damping PTs
Equivalent circuit parameter extraction of low‐capacitance high‐damping PTs Open
Existing equivalent circuit extraction techniques are inaccurate for piezoelectric transformers (PTs) with low‐input capacitance or high damping. A new method is presented, offering improved accuracy in both damping resistance and resonant…
View article: Superior energy density through tailored dopant strategies in multilayer ceramic capacitors
Superior energy density through tailored dopant strategies in multilayer ceramic capacitors Open
Tailored dopant strategies are proposed to optimise the energy density of BiFeO3–SrTiO3, which can be adapted for other high polarisability oxide-based systems.
View article: Fatigue resistant lead-free multilayer ceramic capacitors with ultrahigh energy density
Fatigue resistant lead-free multilayer ceramic capacitors with ultrahigh energy density Open
Electrical homogeneity is vital in optimising energy storage performance in BiFeO3–BaTiO3–xBi(Li0.5Nb0.5)O3 ceramic multilayer capacitors, giving rise to high recoverable energy density ∼13.8 J cm−3 under electric field ∼950 kV cm−1 and fa…