A5003111437- Ferroelectric and Piezoelectric Materials
- Multiferroics and related materials
- Microwave Dielectric Ceramics Synthesis
- X-ray Diffraction in Crystallography
- Metal-Organic Frameworks: Synthesis and Applications
- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Crystal Structures and Properties
- Acoustic Wave Resonator Technologies
- Advanced Battery Materials and Technologies
- Advancements in Battery Materials
- Electronic and Structural Properties of Oxides
- Iron-based superconductors research
- Inorganic Chemistry and Materials
- Mesoporous Materials and Catalysis
- Machine Learning in Materials Science
- Rare-earth and actinide compounds
- Nuclear materials and radiation effects
- Zeolite Catalysis and Synthesis
- Advancements in Solid Oxide Fuel Cells
- Solid-state spectroscopy and crystallography
- Crystallization and Solubility Studies
- Hydrogen Storage and Materials
- Extraction and Separation Processes
- Electrocatalysts for Energy Conversion
Oak Ridge National Laboratory
2020-2025
China Spallation Neutron Source
2025
ALBA Synchrotron (Spain)
2018-2023
Australian Synchrotron
2023
Government of the United States of America
2023
University of Liverpool
2012-2021
SPring-8
2015-2021
Oregon State University
2017-2019
Corvallis Environmental Center
2018
Instituto de Catálisis y Petroleoquímica
2011-2013
Piezoelectric materials convert between electrical and mechanical energy vice versa. They can be found in many different electronic applications from gas sensors to micromotors. While piezoelectrics were first discovered the late 1800s, scientists engineers are still developing new help advance technology. This perspective summarizes history of piezoelectric describes interesting past, present, future. It also highlights challenges fundamental science how chemists make significant...
Archetype stuffed tridymites AM2O4 typically exhibit a polar P622-structure, characterized by MO4-tetrahedra arranged in UDUDUD ring topology, where U (up) and D (down) denote the orientation of with respect to plane grids. However, most adopt centrosymmetric structures due size mismatch between A-cation cavity [M2O4]n− anionic framework, which alters topology results centrosymmetry. Therefore, innovative strategies are pressingly needed design alternative topologies facilitate fine...
Earth-abundant metal oxides are excellent candidates for photocatalytic applications due to their low cost and high stability in aqueous solutions. Materials that contain a combination of cations with an s2 electron lone pair d0 electronic configuration, such as BiVO4, possess favorable band gaps. BiVO4 has also been reported noncentrosymmetric polar properties, flexoelectricity, piezo-photocatalysis, anomalous photovoltaic effect, despite its centrosymmetric crystal structure. Here, it is...
Lithium superionic conductors are pivotal for enabling all‐solid‐state batteries, which aim to replace liquid electrolytes and enhance safety. Herein, we report the discovery of an unprecedented lithium conductor, Li21Ge8P3S34, featuring a novel structural type new composition in Li–Ge–P–S system. This material exhibits high ionic conductivity approximately 1.0 mS cm−1 at 303 K with low activation energy 0.20(1) eV. Its unique crystal structure was elucidated using three‐dimensional electron...
Lithium superionic conductors are pivotal for enabling all‐solid‐state batteries, which aim to replace liquid electrolytes and enhance safety. Herein, we report the discovery of an unprecedented lithium conductor, Li21Ge8P3S34, featuring a novel structural type new composition in Li–Ge–P–S system. This material exhibits high ionic conductivity approximately 1.0 mS cm−1 at 303 K with low activation energy 0.20(1) eV. Its unique crystal structure was elucidated using three‐dimensional electron...
We present five three-dimensional (3D) coordination polymers (CPs) based on the formate ligand, [NaM(HCOO)3(H2O)]n with M = Co2+ and Ni2+ [KM(HCOO)3]n Mn2+, Co2+, Ni2+, introducing three new nuclear structures P21 space group for [NaCo(HCOO)3(H2O)]n [NaNi(HCOO)3(H2O)]n, P6322 Sohncke SG chiral structure [KNi(HCOO)3]n, along two centric C2/c isomorphs [KMn(HCOO)3]n [KCo(HCOO)3]n. Magnetic measurements indicate that antiferromagnetic interactions predominate in CPs, averaged zJ/kB mean values...
Sodium niobate (${\mathrm{NaNbO}}_{3}$ or NN) is described as ``the most complex perovskite system,'' which exhibits transitions between, well coexistence of, several ferroelectrics (FE) and antiferroelectric (AFE) phases at different temperatures. Recently, solid solutions of NN with stabilized AFE phases(s) have gained attention for energy-related applications, such high-density energy storage electrocaloric cooling. A better understanding the atomic mechanisms responsible AFE/FE phase in...
Safety concerns regarding organic-based liquid electrolytes in Li-ion batteries have led to extensive research on lithium-ion conductors. Despite cost-effectiveness, thio-silicate Li4SiS4 has been overlooked owing unclear crystallographic information. This study clarifies the crystal structures and electrochemical properties of two polymorphs their aliovalent substitution series, i.e., Li4–xSi1–xSbxS4. Our findings indicate that differ primarily SiS4 tetrahedra stacking configurations, with...
Lead-free bismuth-based perovskite oxides with polarization directed along the [001]p primitive unit cell edge, analogous to tetragonal PbTiO3, are synthesized at ambient pressure. Enhanced piezoelectric properties, large polarizations, and high depolarization temperatures observed in wide morphotropic phase boundary region formed a rhombohedral phase, up 92.5% Bi on A site. The oxide lead zirconate titanate (PbZr1−xTixO3) (PZT) has extraordinary electromechanical properties (MPB),1 making...
BaFe<sub>0.125</sub>Co<sub>0.125</sub>Zr<sub>0.75</sub>O<sub>3−δ</sub> perovskite is a novel and efficient MIEC electrode for IT-SOFCs. Symmetrical cells with an area-specific resistance of 0.13 Ω cm<sup>2</sup> at 700 °C 0.05 800 have been prepared.
The stereochemical activity of lone pair electrons plays a central role in determining the structural and electronic properties both chemically simple materials such as H2O, well more complex condensed phases photocatalysts or thermoelectrics. TlReO4 is rare example non-magnetic material exhibiting re-entrant phase transition emphanitic behavior long-range structure. Here, we describe Tl+ 6s2 these unusual transitions illustrate its tunability by chemical doping, which has broad implications...
Structure–property relationships were determined for the family of three-layer Aurivillius materials Bi2Sr(A)TiNb2O12 (A = Ca2+, Sr2+, Ba2+). X-ray and neutron diffraction along with selected area electron indicate that Bi2SrBaTiNb2O12 crystallizes in nonpolar I4/mmm space group, whereas polar B2cb group best describes Bi2SrCaTiNb2O12 Bi2Sr2TiNb2O12. Despite different groups, all three compositions show relaxor behavior as evidenced through P(E) dielectric measurements. These properties are...
New structural contributions to conductivity in cubic Li 7−3 x Al La 3 Zr 2 O 12 and differences controlling mechanisms between different substitution types are revealed.
We present the magnetic behavior and resulting transport properties of ${\mathrm{TaSe}}_{2}$ when intercalated by magnetically active cobalt cations. Acting as layered host, is a transition metal dichalcogenide (TMD) that adopts $2H$-polytype. find through our single crystal powder diffraction studies we can prepare stoichiometry ${\text{Co}}_{1/4}{\text{TaSe}}_{2}$, which crystallizes in centrosymmetric space group $P{6}_{3}/mmc$. From susceptibility x-ray photoelectron spectroscopy...
A detailed variable temperature neutron total scattering study of the potential nuclear waste matrix TlTcO
Off the axis: A new lead-free bismuth based perovskite has been formed at ambient pressure in polar Pmc21 structure. Measurements give evidence for ferroelectricity and piezoelectricity. The material is significant due to a rotation of polarization direction off [111]p axis, making it important design materials with morphotropic phase boundary. Detailed facts importance specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset....
Lithium-ion batteries (LIBs) are widely used in electric vehicles, mobile electronic devices, and large-scale stationary energy storage systems. However, their liquid electrolytes present significant safety concerns due to inherent flammability. To address this, the focus has shifted toward all-solid-state (ASSBs) utilizing inorganic solid that promise enhanced safety. In this work, we report discovery of a new crystal structural type Li-ion conductor, Li2GeS3, with unique structure,...
Metal–organic frameworks (MOFs) are promising candidates for hydrogen (H2) storage. However, effective H2 storage in MOFs is challenging, because of weak adsorbent–adsorbate interactions. Optimizing the pore volume, size, and functionality porous crucial, but it still unclear how to maximize capacity while minimizing loading pressure. Herein, we investigate Al-TBAPy (H4TBAPy: 1,3,6,8-tetrakis(p-benzoic acid)pyrene), a low-density MOF, features three interconnected pores (A–C), possesses...
Ausgelenkt: Eine neuer Blei-freier Bismutperowskit wurde bei Umgebungsdruck in der polaren Pmc21-Struktur gebildet. Messungen liefern Beweise für Ferroelektrizität und Piezoelektrizität. Das Material zeichnet sich durch eine Rotation Polarisationsrichtung abseits [111]p-Achse aus ist somit das Design von Materialien mit morphotroper Phasengrenze interessant.