Results 61 to 70 of about 124 (118)

Sustitución de la posición A en la estructura Perovskita ABO3

Revista 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, Moisés Hernández García, Héctor Camacho Montes, Amaury Suárez Gómez, Dania Mayor Hernández   +4 more
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Degradacija kvazi-2D perovskita: nagovještaji izračunima iz prvih principa [PDF]

, 2022
The topic of this master thesis is the study of degradation of quasi-2D perovskite BA_2PbI_4 in the presence of oxygen and light using density functional theory. Binding energies of oxygen to (001) and (110) surface of quasi-2D BA_2PbI_4 perovskite are calculated using geometry optimisation. For (001) surface, we obtain the dependence of binding energy
openaire  

La temperatura de transición en Sr_xBa_1-xHfO₃

Boletín de la Sociedad Española de Cerámica y Vidrio, 2002
In this contribution the transition temperature TC to the cubic phase in SrxBa1-xHfO3 compounds with x = 0.12, 0.25, 0.50, 0.75 and 0.88 is presented. These temperatures were deduced from the measurements of the perturbed angular correlation on tantalum ...
López-García, A., Horowitz, C., Alonso, R. E.   +2 more
doaj  

Mn-substituted perovskites RECo_xMn_1-xO₃: a comparison between magnetic properties of LaCo_xMn_1-xO₃ and GdCo_xMn_1-xO₃

Boletín de la Sociedad Española de Cerámica y Vidrio, 2008
Cooperative phenomena constitute important mechanisms to explain the magnetic properties of the perovskite manganites REMnO3, in which the rare-earth and/or Mn is partially replaced by divalent elements. In this way, the manganese ion changes its valence
Barahona, P., Gil, V., Moure, C., Pecchi, G., Campos, C., Peña, O.   +5 more
doaj  

Magnetic properties of manganese-site substituted Y(Cu,Mn)O₃

Boletín de la Sociedad Española de Cerámica y Vidrio, 2004
The magnetic properties of the solid solution YCuxMn1-xO3 have been investigated in the whole range of possible substitutions 0.30 ≤ x(Cu) ≤ 0.50. The χa.c.
Durán, P., Moure, C., Gutiérrez, D., Peña, O.   +3 more
doaj  

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

Boletín 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., Moure, C., Ghanimi, K., Peña, O., Durán, P.   +4 more
doaj  

La transición de fase I4/mcm→Pm3m en Sr_0.5Ba_0.5HfO_3-δ

Boletín 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., Alonso, R. E., Horowitz, C., López-García, A., Caneiro, A.   +4 more
doaj  

Fuerza foto-electromotriz en películas de perovskita

, 2019
En esta tesis se utiliza la técnica de fuerza foto-electromotriz para realizar la caracterización fotoeléctrica de películas delgadas de perovskita (CH₃NH₃PbI₃: MAPI) y en base a los resultados se propone un mecanismo de transporte de portadores de carga.
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Magnetic properties of Aurivillius lanthanide-bismuth (LnFeO₃)_nBi₄Ti₃O₁₂ (n = 1,2) layered titanates

Boletín 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., Gil, V., Moure, C., Guizouarn, T., Peña, O.   +4 more
doaj  

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

Boletín 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., Tartaj, J., Moure, A., Moure, C.   +3 more
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