Results 101 to 110 of about 1,033 (153)

Spin reversal in Gd(Me,Mn)O3 (Me = Co, Ni)

open access: yesBoletín de la Sociedad Española de Cerámica y Vidrio, 2004
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  

Estudio de las propiedades estructurales y magnéticas de perovskitas complejas Bi(1-x)NdxFe0.7Mn0.3O3 [PDF]

open access: yes, 2018
En esta tesis se presenta la síntesis de perovskitas complejas Bi(1−x)N dxF e0,7Mn0,3O3 (0,00 ≤ x ≤ 0,50). Dos métodos de síntesis fueron usados para obtener los materiales: síntesis rápida de fase líquida (LPS) y reacción de estado sólido (SSR ...
Saavedra Mesa, Diana Elizabeth
core  

La transición de fase I4/mcm→Pm3m en Sr0.5Ba0.5HfO3-δ

open access: yesBoletín de la Sociedad Española de Cerámica y Vidrio, 2001
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  

Magnetic properties of Aurivillius lanthanide-bismuth (LnFeO3)nBi4Ti3O12 (n = 1,2) layered titanates

open access: yesBoletín de la Sociedad Española de Cerámica y Vidrio, 2008
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  

Desarrollo de catalizadores anódicos basados en perovskitas para celdas de combustible de óxido sólido [PDF]

open access: yes
Las pilas de combustible de óxido sólido (SOFCs) se presentan como una alternativa prometedora para generar energía con elevada eficiencia y bajas emisiones de gases, entre otras ventajas, dentro de las que también se destaca la flexibilidad operativa ...
Pompeo, Francisco   +2 more
core  

A note on the different crystalline features of the EuMnO3-based solid solutions as a function of the modifying cation nature

open access: yesBoletín de la Sociedad Española de Cerámica y Vidrio, 2010
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

open access: yesBoletín de la Sociedad Española de Cerámica y Vidrio, 2006
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  

Estudio catalítico sobre RSM empleando óxidos mixtos Perovskitas Sr0.7Mg0.3NixCo1-xO3, obtenidas vía combustión en solución, SCS [PDF]

open access: yes
In the present work, mixed oxides have been prepared, specifically of the perovskite type with formula ABX3 (A= Sr and Mg; B= Co and Ni; X= O) from solution combustion synthesis, SCS, using glycine as fuel and microwave radiation as a source of energy ...
Petit, Eliel   +7 more
core   +1 more source

Crystalline behaviour and electrical properties of manganese perovskites substituted on A or B sites: ErMnO<sub>3</sub> modified by Ca and EuMnO<sub>3</sub> modified by Co

open access: yesBoletín de la Sociedad Española de Cerámica y Vidrio, 2010
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

open access: yesRevista CENIC Ciencias Químicas, 2001
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

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