A5011084585- Ferroelectric and Piezoelectric Materials
- Perovskite Materials and Applications
- Multiferroics and related materials
- Microwave Dielectric Ceramics Synthesis
- Gas Sensing Nanomaterials and Sensors
- Electronic and Structural Properties of Oxides
- Crystallization and Solubility Studies
- Polyoxometalates: Synthesis and Applications
- Ferroelectric and Negative Capacitance Devices
- Advanced Photocatalysis Techniques
- X-ray Diffraction in Crystallography
- Chemical Synthesis and Characterization
- Astronomical Observations and Instrumentation
- Radioactive element chemistry and processing
- Advanced Condensed Matter Physics
- Semiconductor materials and devices
- ZnO doping and properties
- Dielectric materials and actuators
- Copper-based nanomaterials and applications
- Resilience and Mental Health
- Homelessness and Social Issues
- Injury Epidemiology and Prevention
- Magnetic and transport properties of perovskites and related materials
- Geophysics and Gravity Measurements
- Catalytic Processes in Materials Science
North Carolina State University
2020-2024
Newcastle University
2022
A synthetic route has been discovered to thermodynamically unstable, i.e., metastable, Sn(II)–perovskite oxides that have highly sought after as lead-free dielectrics and small bandgap semiconductors. facile exchange of Sn(II) is found by using a low melting SnCl2/SnF2 peritectic flux, yielding mixed A-site (Ba1–xSnx)ZrO3 A- B-site (Ba1–xSnx)(Zr1–yTiy)O3 solid solutions exhibit very high metastability, with up 60% cations calculated reaction energy for decomposition −0.3 eV atom–1. Kinetic...
Recently, many new, complex, functional oxides have been discovered with the surprising use of topotactic ion-exchange reactions on close-packed structures, such as found for wurtzite, rutile, perovskite, and other structure types. Despite a lack apparent cation-diffusion pathways in these types, synthetic low-temperature transformations are possible interdiffusion exchange cations possessing ns
Ferroelectric (Hf,Zr)O2 thin films have attracted increased interest from the ferroelectrics community and semiconductor industry due to their ability exhibit ferroelectricity at nanoscale dimensions. The properties performance of ferroelectric generally depend on various factors such as surface energy (e.g., through grain size or thickness), defects dopants, oxygen vacancies, impurities), electrodes, interface quality, preferred crystallographic orientation (also known texture simply...
A systematic study of (1−<italic>x</italic>)Pb(Fe<sub>0.5</sub>Nb<sub>0.5</sub>)O<sub>3</sub>–<italic>x</italic>BiFeO<sub>3</sub> (<italic>x</italic> = 0–0.5) was performed in order to investigate the strengthening relaxor properties when adding BiFeO<sub>3</sub> into Pb(Fe<sub>0.5</sub>Nb<sub>0.5</sub>)O<sub>3</sub> and forming a solid solution.
Quenching lead-free Na1/2Bi1/2TiO3-based ceramics from sintering temperature is established to increase the depolarization temperature, Td and lattice distortion. In situ synchrotron X-ray diffraction measurements were carried out on furnace cooled quenched Na1/2Bi1/2TiO3 - BaTiO3 (NBT-BT) with 6 9 mol. % BT discern field-induced ferroelectric order. Phase fractions determined full pattern Rietveld refinements utilized together change in unit cell volume calculate volumetric strain resulting...
The discovery of multinary Sn(II)-containing oxides has been severely limited by a lack understanding the factors leading to their thermodynamic stability, e.g., chemical compositions and structure types, as well absence productive synthetic routes. relatively few reported Sn(II)-O-M (M = early transition metal cation) solids frequently decompose at moderate low temperatures. Herein, large-scale predictive modeling approach was used assess structural yielding enhanced stability. This...
The synthesis of kinetically stabilized, i.e., metastable, dielectric semiconductors, represents a major frontier within technologically important fields as compared to thermodynamically stable solids that have received considerably more attention. Of long-standing theoretical interest are Sn(II) perovskites [e.g., Sn(Zr1/2Ti1/2)O3 (SZT)], which isoelectronic Pb-free analogues Pb(Zr1/2Ti1/2)O3 (PZT), commercial piezoelectric composition is dominant in the electronics industry. Herein, we...
Purpose This study aims to explore whether early anti-social fire exposure (ASFE) is associated with how adults engage and they view fire. Design/methodology/approach An opportunistic sample (N = 326) was recruited. Participants completed an online survey exploring ASFE, use, strength of fire-beliefs interest in/attitudes supportive Additionally, implicit bias measured using the affect misattribution procedure (AMP). Findings ASFE engaged more criminalised use as adults. They also scored...
Abstract The removal of lead from commercialized perovskite‐oxide‐based piezoceramics has been a recent major topic in materials research owing to legislation many countries. In this regard, Sn(II)‐perovskite oxides have garnered keen interest due their predicted large spontaneous electric polarizations and isoelectronic nature for substitution Pb(II) cations. However, they not considered synthesizable high metastability. Herein, the perovskite hafnate, i.e., PbHfO 3 space group Pbam , is...
The discovery of Sn(II)-containing oxide semiconductors has been severely limited by a lack understanding the factors leading to their thermodynamic stability, e.g., chemical compositions and structure types, as well absence productive synthetic routes. relatively few reported Sn(II)–O–M (M = early transition-metal cation) frequently decompose at moderate low temperatures. Herein, large-scale predictive modeling approach was used assess structural yielding enhanced stability. This resulted...
The removal of lead from commercialized perovskite-oxide-based piezoceramics has been a recent major topic in materials research owing to legislation many countries. In this regard, Sn(II)-perovskite oxides have garnered keen interest due their predicted large spontaneous electric polarizations and isoelectronic nature for substitution Pb(II) cations. However, they not considered synthesizable high metastability. Herein, the perovskite hafnate, i.e., PbHfO3 space group Pbam, is shown react...
Abstract The removal of lead from commercialized perovskite‐oxide‐based piezoceramics has been a recent major topic in materials research owing to legislation many countries. In this regard, Sn(II)‐perovskite oxides have garnered keen interest due their predicted large spontaneous electric polarizations and isoelectronic nature for substitution Pb(II) cations. However, they not considered synthesizable high metastability. Herein, the perovskite hafnate, i.e., PbHfO 3 space group Pbam , is...
Ferroelectric (Hf,Zr)O2 thin films have attracted increased interest from the ferroelectrics community and semiconductor industry due to their ability exhibit ferroelectricity at nanoscale dimensions. The properties performance of ferroelectric generally depend on various factors such as surface energy (e.g., through grain size or thickness), defects dopants, oxygen vacancies, impurities), electrodes, interface quality, preferred crystallographic orientation (also known texture, simply...
The synthesis of kinetically-stabilized, i.e., metastable, dielectric semiconductors, represents a major frontier within key technologically-important fields as compared to thermodynamically-stable solids that have received considerably more attention. Of longstanding theoretical interest are Sn(II) perovskites (e.g., Sn(Zr1/2Ti1/2)O3, SZT), which Pb-free analogues (Pb(Zr1/2Ti1/2)O3, PZT), commercial piezoelectric composition is dominant in the electronics industry. Herein, we describe this...
Kinetically-stabilized, i.e., metastable, semiconductor dielectrics represent a major new frontier within many key technological fields as compared to thermodynamically-stable solids that have received considerably more attention. Of longstanding interest are Sn(II) perovskites (e.g., Sn(Zr1/2Ti1/2)O3, SZT), which theoretically predicted Pb-free analogues of (Pb(Zr1/2Ti1/2)O3, PZT), commercial piezoelectric compound is dominant in the electronics industry. Herein, we describe synthesis this...