A5058763397- Ferroelectric and Piezoelectric Materials
- Microwave Dielectric Ceramics Synthesis
- Multiferroics and related materials
- Advanced Condensed Matter Physics
- Dielectric properties of ceramics
- Magnetic and transport properties of perovskites and related materials
- Dielectric materials and actuators
- Acoustic Wave Resonator Technologies
- Physics of Superconductivity and Magnetism
- Advanced ceramic materials synthesis
- Advanced Thermoelectric Materials and Devices
- Aluminum Alloys Composites Properties
- Aluminum Alloy Microstructure Properties
- Thermal Expansion and Ionic Conductivity
- Iron-based superconductors research
- Perovskite Materials and Applications
- Rare-earth and actinide compounds
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Microstructure and mechanical properties
- Crystallography and molecular interactions
- Metallurgy and Material Forming
- Advanced materials and composites
- Orthopaedic implants and arthroplasty
- Thermal properties of materials
University of Leeds
2023-2024
Edinburgh Napier University
2021-2023
Helmholtz-Zentrum Berlin für Materialien und Energie
2017-2023
University of Sheffield
2014-2022
Henry Royce Institute
2020-2022
Central South University
2010-2012
Central South University of Forestry and Technology
2010
Tailored dopant strategies are proposed to optimise the energy density of BiFeO<sub>3</sub>–SrTiO<sub>3</sub>, which can be adapted for other high polarisability oxide-based systems.
The mechanisms underpinning high energy storage density in lead-free Ag1–3xNdxTayNb1-yO3 antiferroelectric (AFE) ceramics have been investigated. Rietveld refinements of in-situ synchrotron X-ray data reveal that the structure remains quadrupled and orthorhombic under electric field (E) but adopts a non-centrosymmetric space group, Pmc21, which cations exhibit ferrielectric configuration. Nd Ta doping both stabilize AFE structure, thereby increasing AFE-ferrielectric switching from 150 to...
The structure and thermoelectric (TE) properties of La-doped, A-site-deficient SrTiO3 (Sr1–3x/2LaxTiO3) ceramics sintered in air N2/5% H2 have been investigated. Air-sintered with 0.10 ≤ x < 0.30 appear cubic by X-ray diffraction (XRD) but exhibit superstructure consistent a tetragonal cell (a0a0c–), according to electron (ED) studies. 0.50 additional short-range A-site vacancy (VA) ordering, ≥ are orthorhombic an a–a–c+ tilt system long-range VA ordering. reduced oxygen-deficient XRD...
Ceramic dielectrics are reported with superior energy storage performance for applications, such as power electronics in electrical vehicles. A recoverable density (Wrec) of ∼4.55 J cm-3 η ∼ 90% is achieved lead-free relaxor BaTiO3-0.06Bi2/3(Mg1/3Nb2/3)O3 ceramics at ∼520 kV cm-1. These may be co-fired Ag/Pd, which constitutes a major step forward toward their potential use the fabrication commercial multilayer ceramic capacitors. Compared to stoichiometric Bi(Mg2/3Nb1/3)O3-doped BaTiO3...
Electrical homogeneity is vital in optimising energy storage performance BiFeO<sub>3</sub>–BaTiO<sub>3</sub>–<italic>x</italic>Bi(Li<sub>0.5</sub>Nb<sub>0.5</sub>)O<sub>3</sub> ceramic multilayer capacitors, giving rise to high recoverable density ∼13.8 J cm<sup>−3</sup> under electric field ∼950 kV cm<sup>−1</sup> and fatigue resistance behaviour.
The large electrostrain (1 − <italic>x</italic>)BiFeO<sub>3</sub>-0.3BaTiO<sub>3</sub>-<italic>x</italic>Nd(Li<sub>0.5</sub>Nb<sub>0.5</sub>)O<sub>3</sub> ceramics is explained by the presence of polar nano-regions which distort in direction applied field within multiple local symmetries.
An external magnetic field can induce a transition in $\alpha$-RuCl$_3$ from an ordered zigzag state to disordered that is possibly related the Kitaev quantum spin liquid. Here we present new dependent inelastic neutron scattering and magnetocaloric effect measurements implying existence of additional out liquid phase at upper limit $B_u$. The shows three distinct regimes response. In low response magnon peaks; intermediate regime only continuum scattering, above $B_u$ sharp peaks lower...
Magnetization plateaus in quantum magnets---where bosonic quasiparticles crystallize into emergent spin superlattices---are spectacular yet simple examples of collective phenomena escaping classical description. While magnetization have been observed a number spin-1/2 antiferromagnets, the description their magnetic excitations remains an open theoretical and experimental challenge. Here, we investigate dynamical properties triangular-lattice antiferromagnet Ba$_3$CoSb$_2$O$_9$ its one-third...
Abstract Microwave (MW) dielectric ceramics are used in numerous electronic components for modern wireless communication systems, including antennas, resonators, capacitors and filters. However, to date, MW manufactured by an energy-intensive, conventional high-temperature (> 1000 °C) sintering technology thus cannot be co-sintered with low melting point base electrodes (Ag, Al, etc., < °C), nor directly integrated polymers (< 200 °C). Cold is able densify at °C via a combination of...
Abstract Electrostatic energy storage capacitors are essential passive components for power electronics and prioritize dielectric ceramics over polymer counterparts due to their potential operate more reliably at > 100 ˚C. Most work has focused on non‐linear dielectrics compositions in which polarization (P)/electric displacement (D) maximum field (E max ) optimized give values of density, 6≤U≤21 J cm −3 . In each case however, either saturation (dP/dE = 0, AFE) or “partial” → RFE) P...
Abstract Cold sintered, Li 2 MoO 4 ‐based ceramics have recently been touted as candidates for electronic packaging and low temperature co‐fired ceramic (LTCC) technology but 3 is an expensive endangered raw material, not suited large scale commercialization. Here, we present cold sintered temperature‐stable composites based on LiMgPO (LMP) in which the Mo (and Li) concentration has reduced, thereby significantly decreasing material costs. Optimum compositions, 0.5LMP‐0.1CaTiO ‐0.4K...
For the first time, origin of large electrostrain in pseudocubic BiFeO_{3}-based ceramics is verified with direct structural evidence backed by appropriate simulations. We employ advanced and microstructural characterizations that exhibit (>0.4%) to reveal existence multiple, nanoscale local symmetries, dominantly tetragonal or orthorhombic, which have a common, averaged direction polarization over larger, meso- microscale regions. Phase-field simulations confirm thereby providing new vision...