J. A. Alonso
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View article: Spin-phonon interactions revisited: Far-infrared emission, Raman scattering, and high-resolution x-ray diffraction at the Néel temperature in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>LaFeO</mml:mi> <mml:mn>3</mml:mn> </mml:msub> </mml:mrow> </mml:math>
Spin-phonon interactions revisited: Far-infrared emission, Raman scattering, and high-resolution x-ray diffraction at the Néel temperature in Open
We report on the structural evolution, spin phonon interactions, and magnetoelastic effects in bulk LaFeO3 perovskite across its antiferromagnetic transition. We found that while the lattice constants exhibit slight deviations at the Neel …
View article: Structural Phase Transition and the Effect of Iodine on Phase Stability in Rb <sub>3</sub> Bi <sub>2</sub> Br <sub>9</sub> Perovskite-Related Halides with 2D Dimensionality
Structural Phase Transition and the Effect of Iodine on Phase Stability in Rb <sub>3</sub> Bi <sub>2</sub> Br <sub>9</sub> Perovskite-Related Halides with 2D Dimensionality Open
Rubidium-based halide perovskites Rb3Bi2Br9-xIx (x = 0, 3) represent a lead-free, low-dimensional alternative within the A3B2X9 family, offering promising optoelectronic properties. This work reports the successful synthesis of Rb3Bi2Br9 a…
View article: The crisis of aid: ideal models for the future of development cooperation
The crisis of aid: ideal models for the future of development cooperation Open
The current aid crisis is not merely budgetary, but also structural, undermining the very justification for existing and relevance of the system itself. At the core of this crisis lies the inability of aid to respond to the tectonic shifts…
View article: Polymorphism of Sr<sub>2</sub>ZnIrO<sub>6</sub> Double Perovskite at High Pressure and Temperature
Polymorphism of Sr<sub>2</sub>ZnIrO<sub>6</sub> Double Perovskite at High Pressure and Temperature Open
The structural behavior of Sr2ZnIrO6 double perovskite has been systematically studied under extreme conditions, both at high temperature and high pressure with synchrotron powder X-ray diffraction. At high temperatures, three structural p…
View article: Efficient Mesoporous NiCeLaO<sub>x</sub>‐Based Catalysts Prepared by Nanocasting for the RWGS Reaction
Efficient Mesoporous NiCeLaO<sub>x</sub>‐Based Catalysts Prepared by Nanocasting for the RWGS Reaction Open
In this work, the influence of the porous structure of the catalyst, as well as the effect of La doping on the performance of Ni‐ceria‐based catalysts for the reverse water‐gas shift reaction (rWGS) has been studied. Thus, Ni‐ceria and Ni‐…
View article: Mechanism of Topotactic Reduction-Oxidation Between Mg-Doped SrMoO3 Perovskites and SrMoO4 Scheelites, Utilized as Anode Materials for Solid Oxide Fuel Cells
Mechanism of Topotactic Reduction-Oxidation Between Mg-Doped SrMoO3 Perovskites and SrMoO4 Scheelites, Utilized as Anode Materials for Solid Oxide Fuel Cells Open
Recently, we have described SrMo1-xMgxO3-δ perovskites (x = 0.1, 0.2) as excellent anode materials for solid oxide fuel cells (SOFCs), with mixed ionic and electronic conduction (MIEC) properties. After depositing on the solid electrolyte,…
View article: From Oxidized PrNi<sub>0.9</sub>Al<sub>0.1</sub>O<sub>3</sub> to Reduced PrNi<sub>0.9</sub>Al<sub>0.1</sub>O<sub>2+δ</sub> Perovskite Nickelates: Stabilization of Infinite-Layer Specimens with Monovalent Ni in the Bulk Polycrystalline Form
From Oxidized PrNi<sub>0.9</sub>Al<sub>0.1</sub>O<sub>3</sub> to Reduced PrNi<sub>0.9</sub>Al<sub>0.1</sub>O<sub>2+δ</sub> Perovskite Nickelates: Stabilization of Infinite-Layer Specimens with Monovalent Ni in the Bulk Polycrystalline Form Open
Recently, a new class of high-temperature superconductors, RNiO2 (where R represents rare-earth elements) with infinite-layer (IL) structure, has been identified. They possess the same structural framework as the renowned high-Tc cuprates …
View article: Unlocking the Potential of Mg-Doped Rare Earth Manganites: Machine Learning-Guided Synthesis and Insights into Structural and Optical Properties
Unlocking the Potential of Mg-Doped Rare Earth Manganites: Machine Learning-Guided Synthesis and Insights into Structural and Optical Properties Open
By leveraging machine learning insights from prior perovskite studies and employing the sol–gel method, we successfully synthesized two novel perovskite nanoceramics—M0.5 Ca0.25Mg0.25MnO3 (M = La, Pr)—as multifunctional nanomaterials. X-ra…
View article: Valence Variability Induced in SrMoO₃ Perovskite by Mn Doping: Evaluation of a New Family of Anodes for Solid-Oxide Fuel Cells
Valence Variability Induced in SrMoO₃ Perovskite by Mn Doping: Evaluation of a New Family of Anodes for Solid-Oxide Fuel Cells Open
We report on a series of SrMo1−xMnxO3−δ perovskite oxides designed as potential anode materials for solid oxide fuel cells (SOFCs). These materials were synthesized using a citrate method, yielding scheelite-type precursors with nominal Sr…
View article: Crystal growth, structural phase transitions and optical gap evolution of FAPb(Br1-xClx)3 hybrid perovskites (FA: formamidinium ion, CH(NH2)2+)
Crystal growth, structural phase transitions and optical gap evolution of FAPb(Br1-xClx)3 hybrid perovskites (FA: formamidinium ion, CH(NH2)2+) Open
Chemically tuned organic-inorganic hybrid halide perovskites based on bromide and chloride anions CH(NH2)2Pb(Br1-xClx)3 (CH(NH2)2+: formamidinium ion, FA) have been crystallized and investigated by neutron powder diffraction (NPD), single …
View article: Structure–property coupling in lead-free halides Rb <sub>3</sub> Sb <sub>2</sub> Br <sub>9</sub> and Rb <sub>3</sub> Sb <sub>2</sub> Br <sub>6</sub> I <sub>3</sub> obtained by mechanochemistry
Structure–property coupling in lead-free halides Rb <sub>3</sub> Sb <sub>2</sub> Br <sub>9</sub> and Rb <sub>3</sub> Sb <sub>2</sub> Br <sub>6</sub> I <sub>3</sub> obtained by mechanochemistry Open
Rb 3 Sb 2 X 9 (X = Br, I) halides show a temperature-driven phase transition from monoclinic ( P 2 1 / n ) to trigonal ( P 3̄ m 1). Distortion-mode analysis reveals octahedral rotations as primary drivers, with cation shifts and bond modula…
View article: Valence Variability Induced in SrMoO₃ Perovskite by Mn Doping: Evaluation of a New Family of Anodes for Solid-Oxide Fuel Cells
Valence Variability Induced in SrMoO₃ Perovskite by Mn Doping: Evaluation of a New Family of Anodes for Solid-Oxide Fuel Cells Open
We report on a series of SrMo1-xMnxO3-δ perovskite oxides designed as potential anode materials for solid oxide fuel cells (SOFCs). These materials were synthesized using a citrate method, yielding scheelite-type precursors with nominal Sr…
View article: In situ evolution of surface and bulk properties of Ni/La-doped CeO2 catalysts for CO2 reduction with hydrogen
In situ evolution of surface and bulk properties of Ni/La-doped CeO2 catalysts for CO2 reduction with hydrogen Open
International audience
View article: Competing Localized-Itinerant Magnetism Evidenced by Critical Behavior in the Fe<i><sub>x</sub></i>Ti<sub>2</sub>S<sub>4</sub> Heideite Sulfides
Competing Localized-Itinerant Magnetism Evidenced by Critical Behavior in the Fe<i><sub>x</sub></i>Ti<sub>2</sub>S<sub>4</sub> Heideite Sulfides Open
International audience
View article: Experimental and theoretical study of the phase transition between perovskite polytypes of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>BaPtO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math> under high pressure and temperature
Experimental and theoretical study of the phase transition between perovskite polytypes of under high pressure and temperature Open
APtO3 (A = Ca, Sr, Ba) is a unique family in the complex transition metal oxides with the AMO3 formula. Most 3d and 4dAMO3 compounds adopt the perovskite structure when synthesized at ambient or high pressure; however, APtO3 perovskites ha…
View article: Sr<sub>0.7</sub>R<sub>0.3</sub>CoO<sub>3-δ</sub> (R = Gd, Eu, and Sm) Perovskites Infiltrated with Pd: Enhancing the Performance as Cathode Materials in Solid Oxide Fuel Cells
Sr<sub>0.7</sub>R<sub>0.3</sub>CoO<sub>3-δ</sub> (R = Gd, Eu, and Sm) Perovskites Infiltrated with Pd: Enhancing the Performance as Cathode Materials in Solid Oxide Fuel Cells Open
Perovskites based on Sr0.7R0.3CoO3-δ (R = Gd, Eu, and Sm) were prepared to be used as cathodes in solid oxide fuel cells (SOFC). The materials were synthesized using the citrate-nitrate route and thermal treatments in air atmosphere. The i…
View article: New insights into the magnetism and magnetic structure of LuCrO<sub>3</sub> perovskite
New insights into the magnetism and magnetic structure of LuCrO<sub>3</sub> perovskite Open
A polycrystalline sample LuCrO 3 has been characterized by neutron powder diffraction (NPD) and magnetization measurements. Its crystal structure has been Rietveld refined from NPD data in space group Pnma ; this perovskite contains strong…
View article: Crystal growth, structural phase transitions and optical gap evolution of FAPb(Br1-xClx)3 hybrid perovskites (FA: formamidinium ion, CH(NH2)2+)
Crystal growth, structural phase transitions and optical gap evolution of FAPb(Br1-xClx)3 hybrid perovskites (FA: formamidinium ion, CH(NH2)2+) Open
Chemically tuned organic-inorganic hybrid halide perovskites based on bromide and chloride anions CH(NH2)2Pb(Br1 − xClx)3 (CH(NH2)2+: formamidinium ion, FA) have been crystallized and investigated by neutron powder diffraction (NPD), singl…
View article: Magnetoelectric effect in multiferroic nickelate perovskite YNiO3
Magnetoelectric effect in multiferroic nickelate perovskite YNiO3 Open
The interaction of magnetic order and spontaneous polarization is a fundamental coupling with the prospect for the control of electronic properties and magnetism. The connection among magnetic order, charge localization and associated meta…
View article: Unveiling the Structural Properties, Optical Behavior, and Thermoelectric Performance of 2D CsSn<sub>2</sub>Br<sub>5</sub> Halide Obtained by Mechanochemistry
Unveiling the Structural Properties, Optical Behavior, and Thermoelectric Performance of 2D CsSn<sub>2</sub>Br<sub>5</sub> Halide Obtained by Mechanochemistry Open
Metal halide perovskites with a two-dimensional structure are utilized in photovoltaics and optoelectronics. High-crystallinity CsSn2Br5 specimens have been synthesized via ball milling. Differential scanning calorimetry curves show meltin…
View article: Exploring the Interplay between Structure and Electronic Behavior across Pressure-Induced Isostructural and Structural Transitions in Weyl-Type Semimetal NbAs
Exploring the Interplay between Structure and Electronic Behavior across Pressure-Induced Isostructural and Structural Transitions in Weyl-Type Semimetal NbAs Open
NbAs is a Weyl semimetal and belongs to the group of topological phases that exhibit distinct quantum and topological attributes. Topological phases have a fundamentally different response to external perturbations, such as magnetic fields…
View article: Tuning of Antiferromagnetic Phase in La<sub>1–<i>x</i></sub>Sr<sub><i>x</i></sub>MnO<sub>3</sub> Epitaxial Thin Films by Polymer-Assisted Deposition Synthesis
Tuning of Antiferromagnetic Phase in La<sub>1–<i>x</i></sub>Sr<sub><i>x</i></sub>MnO<sub>3</sub> Epitaxial Thin Films by Polymer-Assisted Deposition Synthesis Open
Epitaxial thin films of the La1-xSrxMnO3 system, spanning a wide range of compositions (0.5 ≤ x ≤ 0.65), have been prepared, using the polymer-assisted deposition method, on SrTiO3 (100) substrates. The primary objective was to achieve the…
View article: High performance of SrCo1-xZrxO3-δ perovskite cathodes for IT-SOFCs
High performance of SrCo1-xZrxO3-δ perovskite cathodes for IT-SOFCs Open
Stabilization of a tetragonal perovskite structure in the SrCoO3-δ system at room temperature has been achieved through wet chemical techniques, and it has been successfully tested in Solid Oxide Fuel Cells (SOFCs). Chemical substitutions …
View article: NdMn1.5Ru0.5O5, a high-performance electrocatalyst with low Ru content for acidic oxygen evolution reaction
NdMn1.5Ru0.5O5, a high-performance electrocatalyst with low Ru content for acidic oxygen evolution reaction Open
A mixed oxide with the crystal structure of the DyMn2O5 family, namely NdMn1.5Ru0.5O5, is reported active for the oxygen evolution reaction (OER) in acidic media. NdMn1.5Ru0.5O5 displays high OER activity of 500 A gRu-1 at 1.5 V. Moreover,…
View article: SrMo<sub>0.9</sub>O<sub>3−δ</sub> Perovskite with Segregated Ru Nanoparticles Performing as Anode in Solid Oxide Fuel Cells
SrMo<sub>0.9</sub>O<sub>3−δ</sub> Perovskite with Segregated Ru Nanoparticles Performing as Anode in Solid Oxide Fuel Cells Open
A new anode material, Ru-SrMo0.9O3-δ, with a perovskite structure and segregated metallic Ru, has been tested in an intermediate-temperature solid oxide fuel cell (IT-SOFC) in an electrolyte-supported configuration giving substantial power…