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oai:docta.ucm.es:20.500.14352/530172024-10-01T15:26:47Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Arévalo López, Ángel M. author Castillo Martínez, Elisabet author Alario Franco, Miguel Ángel author 2008 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. 0953-8984 10.1088/0953-8984/20/50/505207 https://hdl.handle.net/20.500.14352/53017 http://www.iop.org/EJ/journal/JPhysCM Electron energy loss spectroscopy in ACrO3 (A = Ca, Sr and Pb) perovskites