A5087168399- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Crystal Structures and Properties
- Multiferroics and related materials
- Electronic and Structural Properties of Oxides
- Ferroelectric and Piezoelectric Materials
- X-ray Diffraction in Crystallography
- Nuclear materials and radiation effects
- Advancements in Solid Oxide Fuel Cells
- Physics of Superconductivity and Magnetism
- Inorganic Chemistry and Materials
- Microwave Dielectric Ceramics Synthesis
- Catalysis and Oxidation Reactions
- Catalytic Processes in Materials Science
- Rare-earth and actinide compounds
- Chemical Synthesis and Characterization
- Iron-based superconductors research
- Polyoxometalates: Synthesis and Applications
- Advanced Battery Materials and Technologies
- Layered Double Hydroxides Synthesis and Applications
- Luminescence Properties of Advanced Materials
- Zeolite Catalysis and Synthesis
- Advancements in Battery Materials
- Thermal Expansion and Ionic Conductivity
- X-ray Spectroscopy and Fluorescence Analysis
Universidad Complutense de Madrid
2016-2025
Rede de Química e Tecnologia
2019
Institut de Chimie de la Matière Condensée de Bordeaux
2010-2011
Université de Bordeaux
2010-2011
Centre National de la Recherche Scientifique
2010-2011
University of Sheffield
2007-2009
Universidad de La Laguna
2009
Instituto de Tecnología Química
2009
Universitat Politècnica de València
2009
Instituto de Ciencia de Materiales de Madrid
2002-2008
The pore topology of ITQ-15 zeolite consists an ultra-large 14-ring channel that is intersected perpendicularly by a 12-ring pore; acid sites have been introduced in its framework and this unique structure shows advantages over unidirectional ultralarge zeolites for diffusing reacting large molecules.
Conventional sodium-based layered oxide cathodes are extremely air sensitive and possess poor electrochemical performance along with safety concerns when operating at high voltage. The polyanion phosphate, Na
Silica has many industrial (i.e., glass formers) and scientific applications. The understanding prediction of the interesting properties such materials are dependent on knowledge detailed atomic structures. In this work, amorphous silica subjected to an accelerated alkali reaction (ASR) was recorded at different time intervals so as follow evolution structure by means high-resolution transmission electron microscopy (HRTEM), energy loss spectroscopy (EELS), pair distribution function...
Improved electrochemical performance of (Nd,Gd) 1/3 Sr 2/3 CoO 3− δ :Ce 0.9 (Gd,Nd) 0.1 O 1.95 air electrode for SOFCs employing spray pyrolysis deposition and simultaneous decoration with Ag nanoparticles.
We report a synthesis method to stabilize TiO2 rutile nanoparticles (around 10 nm) and keep the particle size when reduced down TiO1.84. TiO2−δ exhibit room-temperature ferromagnetism that becomes stronger for The reduction mechanism Magneli phases excludes relevant influence of oxygen vacancies in modification magnetic properties. arrangement Ti3+ could give rise hopping single 3d electron inducing local ferromagnetic-like behavior.
A new oxide of the Ruddlesden–Popper series in (Eu,Sr)<sub>n+1</sub>(Co,Fe)<sub>n</sub>O<sub>3n+1</sub> system has been isolated and structurally characterized.
Abstract Gold‐coated silver nanoparticles (Ag@AuNPs) are synthesized by green synthesis using Vaccinium corymbosum as reducing agent. The obtained Ag@AuNPs present a core‐shell structure with nanostar shape. absorption spectrum of these shows prominent band centred at 680 nm, within the optimal range for photothermal applications. Dispersions in water, 1.87 10 NPs/mL, reach temperature 44.3 °C under laser excitation minutes, which is suitable hyperthermia therapy. internalization Ag@AuNPs,...
Photocatalytic hydrogen evolution from water is investigated in Ba–Sr–Ta–O layered compounds possessing two different crystal structures: Sr2Ta2O7 (S.G. Cmcm, a (110) type pervoskite), and BaSrTa2O7 Immm, (100) perovskite). High purity samples of are successfully prepared by solid state reaction. Hydrogen production under UV irradiation 26% larger (15.2 mmol g−1) than (11.4 g−1). The band gaps determined diffuse reflectance spectroscopy (DRS) 4 eV 4.6 for Sr2Ta2O7, respectively. Density...
Abstract Structural properties of rare earth niobates (RE 3 NbO 7 , RE = Y, Er, Yb, Lu) have been studied using selected area electron diffraction (SAED) and high resolution transmission microscopy (HRTEM). SAED patterns show diffuse scattering features along the [111] direction pure fluorite ( Fm–3m ) structure due to a short‐range ordering anion vacancies in or change coordination number around some cations. The latter is related presence small domains pyrochlore phase (Fd‐3m), which are...
The crystal and magnetic structure of ${\mathrm{Ba}}_{5}{\mathrm{Co}}_{5}{\mathrm{O}}_{14}$ has been determined by means x-ray neutron diffraction. This oxide trigonal symmetry (space group $P\text{\ensuremath{-}}3m1$) lattice parameters $a=5.6453(3)\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}}$ $c=11.9223(7)\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}}$. main structural feature is the presence blocks composition ${\mathrm{Co}}_{3}{\mathrm{O}}_{12}$, folded along $c$ axis, built up units three...
The crystal structures of 6H-type BaMn0.15Ti0.85O3, BaMn1/4Ti3/4O2.95, and BaMn1/2Ti1/2O2.84 12R-type BaMn2/3Ti1/3O3 have been established by a combination X-ray, neutron, electron diffraction, high-resolution microscopy. structure (space group P63/mmc) can be described stacking sequence (hcc)2 along the c-axis with any anion deficiency located exclusively in h-BaO3 layers. Ti atoms display strong preference for corner-shared octahedral site, whereas both Mn are distributed over sites face...
A new ternary manganese vanadate, NaMnVO(4), was synthesized by solid state reaction route, and its crystal structure magnetic properties were characterized X-ray diffraction, susceptibility specific heat measurements, density functional calculations. NaMnVO(4) crystallizes in the maricite-type with space group Pnma, a = 9.563(1) A, b 6.882(1) c 5.316(1) Z 4. contains MnO(4) chains made up of edge-sharing MnO(6) octahedra, these are interlinked VO(4) tetrahedra. The has broad maximum at...
New phases with one-dimensional structures in the A−Co−O system (A = Ca, Sr, Ba) have been isolated and characterized by electron diffraction high-resolution microscopy. (Ca0.4Sr0.6)9Co7O21, Sr14Co11O33, Sr21Co17O51, Ba15Co13O39, Ba66Co59O177 are members of an homologous series general formula (A3Co2O6)α(A3Co3O9)β. All them constituted ordered intergrowth structural frames limiting this series: Ca3Co2O6 2H−BaCoO3. commensurate derived a modulation vector k (a*2H + b*2H)/3 m2c*2H, m being...
A combination of X-ray, neutron and electron diffraction, high-resolution microscopy have been used to establish the 5H structural type a new hexagonal-type perovskite BaMn0.2Co0.8O2.80. The structure can be described as (cc′chh) hexagonal polytype with ordered oxygen vacancies where cubic c′ layer corresponds composition [BaO2] opposed [BaO3]. resulting consists [MnCo2O12] blocks three sharing faces octahedra linked by corners two unconnected [CoO4] tetrahedra. Electron Energy Switch order...
We report the rich magnetic behaviour of Sr2CoNb1-xTixO6 (0 ≤ x 0.5) oxides as a result their complex microstructure. Although these show an average simple-cubic perovskite structure, they present flexible microstructure due to short-range ordering between Co/Ti and Nb cations in B-sites. The consists double-cubic domains grown matrix. size number decrease Ti content increases. As aliovalent substitution Nb(5+) by Ti(4+) parent Sr2CoNbO6 mixed-valence Co(3+)/Co(4+) are obtained. A spin...