A5036727416- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Multiferroics and related materials
- Physics of Superconductivity and Magnetism
- Ferroelectric and Piezoelectric Materials
- Advanced Photocatalysis Techniques
- Advancements in Solid Oxide Fuel Cells
- Electronic and Structural Properties of Oxides
- Advanced oxidation water treatment
- Catalytic Processes in Materials Science
- Electrocatalysts for Energy Conversion
- Advancements in Battery Materials
- TiO2 Photocatalysis and Solar Cells
- Layered Double Hydroxides Synthesis and Applications
- Rare-earth and actinide compounds
- Microwave Dielectric Ceramics Synthesis
- Iron-based superconductors research
- Thermal Expansion and Ionic Conductivity
- Catalysis and Hydrodesulfurization Studies
- Gas Sensing Nanomaterials and Sensors
- Industrial Gas Emission Control
- Advanced Battery Materials and Technologies
- Supercapacitor Materials and Fabrication
- Hybrid Renewable Energy Systems
- Perovskite Materials and Applications
Universidad Politécnica de Madrid
2015-2024
Universidad Complutense de Madrid
2006-2016
Instituto Tecnológico y de Energías Renovables
2010
University of Castilla-La Mancha
2010
Hospital General Universitario de Albacete
2008
CoFe layered double oxide (CoFe LDO) anchored on g-C3N4 was prepared by mixing appropriate amounts of layer hydroxide and melamine at moderate synthesis temperatures. The resulting LDO/g-C3N4 composite has superior properties in peroxymonosulfate (PMS) activation, remarkable activity catalyzing paracetamol degradation. It been able to degrade 10 mg/L less than min darkness using 0.2 g/L catalyst 0.5 mM PMS dosages. effects dosage, initial pH coexisting anions were also investigated....
This work provides a novel model for solar PV – hydrogen (H2) systems that uses weather data and electrical variables of the components to perform PV-H2 design different hybrid configurations. The objectives are size operate optimally reach target production (QH) minimize cost H2. component sizes optimized by PV-EL direct coupling where EL curves determined number area cells connected modules. use maximum power point (MPP) tracking increases factor (and QH), but this gain is not significant...
Over the past decade, one of main challenges in industry concerns reusing/recycling wastewater, mainly due to its high treatment cost and complexity. The integration waste-to-hydrogen strategy proposes a potential revalorization waste into value-added products towards circular economy model. Integrating industrial wastewater (IWW) electrolysis supply chain potentially represents sustainable approach for H2 production treatment. This critical review analyses current status evaluates variables...
Abstract Cation ordering in ABO 3 perovskites adds to their chemical variety and can lead properties such as ferrimagnetism magnetoresistance Sr 2 FeMoO 6 . Through high‐pressure high‐temperature synthesis, a new type of “double double perovskite” structure has been discovered the family MnRMnSbO (R=La, Pr, Nd, Sm). This tetragonal 1:1 order cations on both A B sites, with A‐site Mn 2+ R 3+ ordered columns Sb 5+ having rock salt sites. The are ferrimagnetic at low temperatures additional...
The ferromagnetic zircon-type phase of ${\mathrm{GdCrO}}_{4}$ presents high values for the magnetocaloric (MC) parameters. This compound has large isothermal entropy changes $\mathrm{\ensuremath{\Delta}}{S}_{T}$ under magnetic field action in a wide temperature range, from 5 to 35 K, reaching maximum $|\mathrm{\ensuremath{\Delta}}{S}_{T}|=29.0\ifmmode\pm\else\textpm\fi{}0.1\phantom{\rule{0.28em}{0ex}}\mathrm{J}/\mathrm{kg}\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ at 22 increment...
We report the magnetic properties and structure of zircon-type compound ${\mathrm{GdVO}}_{4}$, together with isostructural ${\mathrm{NdVO}}_{4}$. At $T\ensuremath{\simeq}2.5$ K, ${\mathrm{GdVO}}_{4}$ undergoes a phase transition to antiferromagnetic ${G}_{z}$, driven mainly by exchange interactions, while anisotropy dipolar interactions are minor contributions. Near liquid-helium boiling temperature, magnetocaloric effect is nearly as large that structurally closely related...
Perovskite oxides, with an ABO3 general formula, have attracted much attention as effective peroxymonosulfate (PMS) activators because of their composition adjustability and chemical stability. A doping strategy has been applied to enhance the PMS activation capability modulation crystal structure parent LaCoO3-δ perovskite by substituting Co atoms located at B-site, high valence state transition metals. Herein, a series LaCo1-xMoxO3-δ perovskites were prepared different Mo content, showing...
Two new Mn<sub>2</sub>ScSbO<sub>6</sub> polymorphs are presented: an antiferromagnetic double perovskite (DPv) and a multiferroic Ni<sub>3</sub>TeO<sub>6</sub>-type (NTO) induced by site-selective disorder.
The perovskite polymorph of Mn(2)CrSbO(6) compound has been synthesized at 8 GPa and 1473 K. It crystallizes in the monoclinic P21/n space group with cell parameters a = 5.2180 (2) Å, b 5.3710(2) c 7.5874(1) Å β 90.36(1)°. Magnetic susceptibility magnetization measurements show simultaneous antiferromagnetic ordering Mn(2+) Cr(3+) sublattices below TN 55 K small canting. Low temperature powder neutron diffraction reveals commensurate magnetic structure spins confined to ac-plane propagation...
Ruddlesden-Popper phases (R-P) with the chemical formula SrxLa2-xCoO4±δ (x=0.6, 0.8, 1.0, 1.2, and 1.5), consisting of alternating layers perovskite rock-salt type oxides, were found to be efficient catalysts for peroxymonosulfate (PMS) activation. By modifying strontium content, it is possible tune spin state cobalt in material, which turn affects PMS activation mechanism. When layer intercalated R-P structure, as Sr0.8La1.2CoO4, a non-radical pathway involved, exhibits superior performance...
The perovskite form of the Mn2FeSbO6 oxide has been obtained at 5.5 GPa and 1523 K. X-ray neutron diffraction data reveal that this compound crystallizes in monoclinic P21/n space group with a = 0.5234 nm, b 0.5389 c 0.7642 nm β 90.372° lattice parameters. AC DC magnetic susceptibility measurements suggest existence complex behavior below 200 structure determined can be described on basis an elliptical spiral incommensurate propagation vector, k [0,0.426,0], where moments 2Mn(2+) Fe(3+)...
The CdCr2O4 spinel transforms to a 10.6% denser new polymorph of the CaFe2O4-type structure at 10 GPa and 1100 °C. This has honeycomb-like because double rutile-type chains formed by [Cr−O6] edge-shared octehedra. crystal is prone be magnetically frustrated presents low-dimensional antiferromagnetism 25 K < T 150 K, accompanied more complex interactions as temperature decreases. These transitions are evidenced magnetic susceptibility heat capacity measurements. We also discuss possible...
A recent high-pressure study on barium chromate BaCrO${}_{4}$ reported a phase transition but the structure of could not be identified. This was suggested to have monoclinic different from other forms $AB$O${}_{4}$-type compounds. In this work, we carried out x-ray diffraction measurements up 46 GPa using He as quasihydrostatic pressure medium and density-functional theory calculations. Our studies allow us identify $P$2${}_{1}$2${}_{1}$2${}_{1}$ post-barite-type phase, recently for...
Multiferroic materials exhibit two or more ferroic orders and have potential applications as multifunctional in the electronics industry. A coupling of ferroelectricity ferromagnetism is hereby particularly promising. We show that synthetic melanostibite mineral Mn2 FeSbO6 (R3‾ space group) with ilmenite-type structure exhibits cation off-centering results alternating modulated displacements, thus allowing antiferroelectricity to occur. Massive magnetoelectric (MEC) magnetocapacitance effect...
The pure and cerium doped sodium bismuth titanate inorganic powders were synthesized by solid state reaction method. presence of rhombohedral phase was observed in NBT compounds. At 1200 °C, the 5% compound forms single perovskite phase. samples x = 0.10 0.15 heat treated to 1350 binary phases with oxides observed. X-ray diffraction, fourier transform infrared spectroscopy, reflectance spectra, differential thermal analysis thermo gravimetric used analyze various properties samples....
Developing efficient and recyclable heterogeneous catalysts in advanced oxidation processes towards aqueous organic pollutants degradation on real samples remains challenging. Herein, semiconductor heterojunction photocatalysts with variable composition (ZnxNi1−xFe2O4@BiOBr; x = 0, 0.2, 0.5, 0.8 1) were synthesized through a two steps hydrothermal process. The influence of cation composition, microstructure heterojunction, catalyst peroxymonosulfate (PMS) dosage pH variation investigated for...
The perovskite "PbCrO(3)" was synthesized at high pressure and temperature. Its magnetic properties have been investigated by means of magnetization, specific heat, resistivity measurements. Earlier workers had concluded it to a G-type antiferromagnetic structure. However, our measurements suggest rather more complex situation: first, weak ferromagnetic transition the Cr(IV) spins occurs 245 K; this is followed temperature-driven spin reorientation starting 185 K ending 62 K. Since...