Results 111 to 120 of about 2,002 (164)
La transición de fase I4/mcm→Pm3m en Sr0.5Ba0.5HfO3-δ
The effect of partial substitution of cations in AMO3 compounds have been studied because the physical properties and applications of these materials can be improved. In particular we are interested in the Sr1-xBaxHfO3 family.
Lamas, D. +4 more
doaj
Estudio de nuevas perovskitas AA'BB'06 : influencia de los cationes A y B sobre sus propiedades físicas y estructuras cristalinas y magnéticas [PDF]
Tesis (Doctora en Ciencias Químicas) - - Universidad Nacional de Córdoba. Facultad de Ciencias Químicas, 2018.El objetivo general de esta tesis doctoral consiste en diseñar, sintetizar y caracterizar a través de diversas técnicas, nuevos materiales que ...
Arciniegas Jaimes, Diana Marcela
core
Spin reversal in Gd(Me,Mn)O3 (Me = Co, Ni)
Partial substitution of the rare-earth by calcium at the cationic site of the ABO3 perovskites may show extraordinary effects of spin reversal due to a negative polarization between the rare-earth and the manganese networks, as it occurs in the solid ...
Gutiérrez, D. +4 more
doaj
Magnetic properties of Aurivillius lanthanide-bismuth (LnFeO3)nBi4Ti3O12 (n = 1,2) layered titanates
Bismuth titanates of Aurivillius layer-structure (BiFeO3)nBi4Ti3O12, are of great technological interest because of their applications as non-volatile ferroelectric memories and high-temperature piezoelectric materials. The synthesis and crystallographic
Tartaj, J. +4 more
doaj
The structural properties of solid solutions based on EuMnO3, in which Eu has been substituted by divalent Ca2+ and Mn by the divalent cation Ni2+ or the variable valence cation Co2+-Co3+ have been studied by X-ray diffraction (XRD) and X-ray absorption ...
Peña, O. +3 more
doaj
Spark plasma sintering of hydrothermally derived ultrafine Ca doped lanthanum chromite powders
Lanthanum chromite nano-particles, with a composition of La0.9Ca0.1CrO3 and La0.8Ca0.2CrO3, were produced by 1 h of hydrothermal reaction at 400 and 425°C respectively.
Rendón-Angeles, J. C. +6 more
doaj
Impact of Ni/Co in perovskites as catalysts for syngas production via methane reforming with CO2 [PDF]
Se sintetizaron óxidos mixtos tipo perovskitas en capas An+1BnX3n+1 (A = Sr/Ba; B = Co/Ni; X = O) mediante combustión en solución (SCS) asistida por radiación de microondas.
Fereira, Carla +6 more
core +1 more source
Cálculos de Estructura Electrónica en Perovskitas BiFeO3 y YCrO3
Se estudia la estructura electrónica de las perovskitas BiFeO3 y YCrO3. Para el BiFeO3 se utilizaron los arreglos antiferromagnéticos tipo A y G. Y para el YCrO3 los arreglos antiferromagnéticos tipo A, C y G. Se utilizó la teoría del funcional de densidad implementada en el paquete Quantum ESPRESSO y pseudopotenciales ultrasuaves junto a la ...
openaire +2 more sources
The structural and electrical features of the manganites solid solutions (Er,Ca)MnO<sub>3</sub> and Eu(Co,Mn)O<sub>3</sub>, have been studied by X-ray diffraction and conductivity measurements. Powders were prepared by solid-state
Tartaj, J. +3 more
doaj
Sustitución de la posición A en la estructura Perovskita ABO3
El trabajo se propuso estudiar la influencia de la introducción del bismuto como dopante en la estructura de la Perovskita ABO3, a través de la comparación de los resultados con cerámicas similares dopadas con lantano y de la aplicación de nuevos procedimientos de análisis de densificación durante la sinterización.
María Dolores Durruthy Rodríguez +4 more
openaire +1 more source

