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Título:
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Electron energy loss spectroscopy in ACrO3 (A = Ca, Sr and Pb) perovskites
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Autores:
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Arévalo López, Ángel M. ;
Castillo Martínez, Elizabeth ;
Alario Franco, Miguel Ángel
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Tipo de documento:
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texto impreso
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Editorial:
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Institute of Physics, 2008
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Química: Química inorgánica
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Materia = Ciencias: Física: Física del estado sólido
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Materia = Ciencias: Química: Materiales
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Tipo = Artículo
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Resumen:
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We present the experimental ELNES spectra of the Cr-L2,3 and O-K edges in three high pressure synthesized perovskites, ACrO3 (A = Ca, Sr and Pb). A comparison of the experimental spectra against the theoretical calculations shows the influence of the A cation in the features of the spectrum. The Cr-L2,3 multiplet structure of these perovskites shows similar integrated intensity ratio (IL3/IL2) between them and with the CrO2, implying that all of them are indeed composed by Cr4+. But the O-K pre-edge observed in CrO2, typical of its d3L character (L-ligand hole), is not present in these perovskites. The effect of the A cation manifests itself in the O-K edge. The different features in the peak edges are caused by the change in the interaction between oxygen and the A cation from being via p orbitals (with Pb) to being via d orbitals (with Ca, Sr). The experimental spectra of the samples are reproduced well by the presented DFT calculations.
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En línea:
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https://eprints.ucm.es/id/eprint/8824/1/JPCM20%2808%29505207-ACrO3EELS.pdf
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