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Electron energy loss spectroscopy in ACrO3 (A = Ca, Sr and Pb) perovskites

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Arévalo López, Ángel M. and Castillo Martínez, Elizabeth and Alario Franco, Miguel Ángel (2008) Electron energy loss spectroscopy in ACrO3 (A = Ca, Sr and Pb) perovskites. Journal of Physics: Condensed Mater, 20 . p. 505207. ISSN 0953-8984

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Official URL: http://www.iop.org/EJ/journal/JPhysCM



Abstract

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.


Item Type:Article
Uncontrolled Keywords:perovskites, high pressure, eels, dft
Subjects:Sciences > Chemistry > Chemistry, Inorganic
Sciences > Physics > Solid state physics
Sciences > Chemistry > Materials
ID Code:8824
Deposited On:14 Aug 2009 11:33
Last Modified:09 Sep 2015 12:02

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