A5058066049- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Advancements in Solid Oxide Fuel Cells
- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Physics of Superconductivity and Magnetism
- Multiferroics and related materials
- Thermal Expansion and Ionic Conductivity
- Inorganic Chemistry and Materials
- Electronic and Structural Properties of Oxides
- Solid-state spectroscopy and crystallography
- Layered Double Hydroxides Synthesis and Applications
- Advanced Battery Technologies Research
- Fluorine in Organic Chemistry
- Iron-based superconductors research
- Supercapacitor Materials and Fabrication
- Inorganic Fluorides and Related Compounds
- Catalysis and Oxidation Reactions
- Extraction and Separation Processes
- Catalytic Processes in Materials Science
- Perovskite Materials and Applications
- Rare-earth and actinide compounds
- Nuclear materials and radiation effects
- Chemical Synthesis and Characterization
- Microwave Dielectric Ceramics Synthesis
Universidad Complutense de Madrid
2016-2024
University of Oxford
2021-2024
The Faraday Institution
2021-2024
University of Münster
2024
Kyoto Bunkyo University
2024
Kyoto University
2024
Kyoto University Institute for Chemical Research
2024
All fluorochemicals—including elemental fluorine and nucleophilic, electrophilic, radical fluorinating reagents—are prepared from hydrogen fluoride (HF). This highly toxic corrosive gas is produced by the reaction of acid-grade fluorspar (>97% CaF 2 ) with sulfuric acid under harsh conditions. The use to produce fluorochemicals via a process that bypasses HF desirable but remains an unsolved problem because prohibitive insolubility . Inspired calcium phosphate biomineralization, we herein...
Transitioning to electrified transport requires improvements in sustainability, energy density, power lifetime, and approved the cost of lithium-ion batteries, with significant opportunities remaining development next-generation cathodes. This presents a highly complex, multiparameter optimization challenge, where developments cathode chemical design discovery, theoretical experimental understanding, structural morphological control, synthetic approaches, reduction strategies can deliver...
Halide-based ionic conductors have attracted growing interest as solid electrolyte candidates because of their suggested electrochemical oxidation stability and deformability. However, most the discovered sodium metal halides exhibit relatively low conductivities. To address this, a new class mechanochemically stabilized, low-crystalline oxyhalides NaMOCl4 (M = Nb, Ta) is developed. By using combination scanning electron microscopy–energy dispersive X-ray spectroscopy, diffraction, pair...
A decreasing coherence length with higher Zr content in ball milled Na 3− x In 1− Cl 6 is observed, which leads to a negative correlation between the ionic conductivity and material's length.
Excellent performance as a cathode material for IT-SOFCs is found in (GdBa)<sub>0.8</sub>Ca<sub>0.4</sub>Co<sub>0.6</sub>Fe<sub>1.4</sub>O<sub>6−δ</sub> related to complex crystal superstructure based on ordering of Gd, Ba and Ca combination with different coordination polyhedral Co Fe layered-location anion vacancies.
Room-temperature multiferroism in polycrystalline antiferromagnetic Fe perovskites is reported for the first time. In perovskite-type oxides RE1.2Ba1.2Ca0.6Fe3O8 (RE = Gd, Tb), interplay of layered ordering Gd(Tb), Ba, and Ca atoms with FeO4-tetrahedra (T) FeO6-octahedra (O) results a polar crystal structure. The structure consists stacking sequence RE/Ca-RE/Ca-Ba-RE/Ca layers combination TOOT unit cell. A moment 33.0 μC/cm2 Gd-oxide (23.2 Tb one) determined from displacements cations,...
Layered perovskites of the Gd0.8-xBa0.8Ca0.4+xFe2O5+δ system show oxygen reduction reaction (ORR) activity. The layered crystal structure these oxides is established by interplay Gd3+, Ba2+, and Ca2+ locations with ordering coordination polyhedra Fe3+ cations. Substitution Gd3+ increases deficiency that accommodated formation layers FeO5-squared pyramids intercalated A-O containing mainly Gd3+. presence in promotes diffusion then ORR Therefore, GdBa2Ca2Fe5O13 oxide which presents lower area...
Ozone oxidation has allowed the stabilization of a very high iron state in FeSr2YCu2O7.85 cuprate, which long-range magnetic ordering valent cations coexists with superconducting interactions (magnetic temperature TN = 110 K > critical Tc 70 K). The somewhat unexpected A-type AFM structure, μ(Fe) ∼ 2 μB saturation moment associated hypervalent sublattice, suggests an unusual low spin for cations, while dimensionality structure results soft switching toward ferromagnetism under small external...
Reaction between Na2FeSbO5 and LiNO3 at 300 °C yields the metastable phase Li2FeSbO5 which is isostructural with sodium "parent" (space group Pbna, a = 15.138(1) Å, b 5.1440(3) c 10.0936(6) Å) consisting of an alternating stack Li2Fe2O5 Li2Sb2O5 sheets containing tetrahedral coordinated Fe3+ octahedrally Sb5+, respectively. Further reaction NO2BF4 in acetonitrile room temperature LiFeSbO5, adopts orthorhombic structure Pbn21, 14.2943(4) 5.2771(1) 9.5610(3) LiFeO5 layers have shifted on...
Perovskite La0.3Ca0.7Fe0.7Cr0.3O3-δ (LCFCr) is a mixed ionic and electronic conductor (MIEC) that can be employed as an electrode material in reversible solid oxide fuel cells (RSOFCs). In this work, ultra-fast (15 min) one-step microwave (MW)-assisted combustion synthesis route has been developed to obtain phase pure highly crystalline LCFCr powder. The synthesized powders exhibited sponge-like microstructure with increased electrochemical reaction sites. Neutron thermodiffraction analysis...
The electrochemical properties of YSr<sub>2</sub>Cu<sub>2</sub>FeO<sub>7+δ</sub> with YBaCuO-type structure have been studied.
Cation migration on electrochemical cycling can significantly influence the performance of li-ion cathode materials. Phases composition LiFe2–xInxSbO6 (0 < x <1) adopt crystal structures described in space group Pnnm, consisting a hexagonally close-packed array oxide ions, with Fe/In and Sb cations ordered octahedral sites, lithium located within partially occupied tetrahedral sites. NPD, SXRD, 57Fe Mössbauer data indicate that reductive insertion (either chemically or electrochemically),...
Li3Fe3Te2O12 adopts a crystal structure, described in space group Pnnm, related to that of LiSbO3, which Te6+, Fe3+, and Li+ cations reside partially ordered configuration within an hcp array oxide ions. Chemical or electrochemical insertion lithium is accompanied by fully reversible migration some the Fe with initial capacity 120 mA h g–1 (2.85 Li per formula unit). Long-term cycling stability limited facile reduction Te6+ elemental Te, leads cathode decomposition. Partial substitution In...
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The herein presented study of the Na 3−2 x In( iii ) 1− Ta( v Cl 6 system with respect to their perovskite crystal structure, microstructure, and ionic transport properties demonstrates coupling among these three aspects.
The antiferromagnetic behavior of Fe3+ oxides composition RE1.2Ba1.2Ca0.6Fe3O8, RE2.2Ba3.2Ca2.6Fe8O21, and REBa2Ca2Fe5O13 (RE = Gd, Tb) is highly influenced by the type oxygen polyhedron around cations their ordering, which coupled with layered RE/Ba/Ca arrangement within perovskite-related structure. Determination magnetic structures reveals different moments associated spins in polyhedra (octahedron, tetrahedron, square pyramid). structural aspects impact on strength Fe-O-Fe superexchange...
The A mixed-valence Y0.9Ba1.7Ca2.4Fe5O14.7 layered perovskite is obtained after topochemical oxygen insertion in Y0.9Ba1.7Ca2.4Fe5O13 under ozone flow. crystal structure has been determined with a combination of diffraction and microscopy techniques. Mössbauer spectroscopy reveals 5 Fe3.8+ → 2 Fe3+ + 3 Fe(4+δ)+ charge disproportionation accompanied by smooth magnetic electronic transition beginning at about 125 K. arrangement assisted the character suggested. Two-dimensional interactions are...
B-site-layer-ordered double perovskite Ca2FeMnO6 with unusually high valence Fe4+ was found to exhibit unusual oxygen-release behaviors, contrasting those of the B-site-disordered having identical chemical composition. During heating, compound shows a stepwise oxygen release successive changes from Fe3+ through an intermediate Fe3.5+, whereas releases in single step. The is released only two-dimensional Fe layers, and this selective stabilizes Fe3.5+ phase in-plane-oxygen-vacancy ordering....
The influence of rare earth (RE) elements on superconducting properties the transition element (TE)-substituted TE xCu1- xSr2RECu2O y cuprates has not been sufficiently emphasized so far. In case molibdo-cuprates with general formula Mo0.3Cu0.3Sr2RECu2O y, all RE containing compounds except La, Ce, and Lu can be prepared at room pressure. crystal structure after ozone oxidation present system is reported selecting three groups attending to their different atom sizes: small (Yb Tm), medium...
LaSrNiIrO6 adopts a B-site cation-ordered double perovskite structure with strong a–a–c + cooperative tilting distortion (space group P21/n = 5.5931(1) Å, b 5.5676(1) c 7.8850(1) β 90.01(1) o). Magnetization and neutron diffraction data indicate 'type II' antiferromagnetic (TN 70 K) in which the Ni spins are arranged an manner their next-nearest-neighbors, no ordered moment observed for Ir. DFT calculations, including spin-orbit coupling effects, confirm S 1 Ni2+ Jeff 0 Ir5+ local...
Li-ion batteries have transformed daily life by acting as energy dense, rechargeable power sources for a wide range of electronic devices.As part the UK Faraday Institute FutureCat [1] project we are investigating new lithium-ion battery cathode materials application in all-electric vehicles.In addition to normal requirements maximizing density and output, this also trying move away from cobalt-based due their poor environmental impacts; focused on containing earth-abundant elements, with...