Ion state of atoms and the properties of perovskite-like compound CaCu3V4O12

The binding energies and valence state of atoms in the perovskite-like compound CaCu3V4O12 have been determined using XPS spectroscopy. The stoichiometry of this phase is formulated as Ca2+Cu2+Cu2+(V25+V24+O12). Under an air atmosphere, the phase interacts with water vapor and oxygen. As a result, C...

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Bibliographic Details
Published in:Russian journal of inorganic chemistry 2007-03, Vol.52 (3), p.329-333
Main Authors: Volkov, V. L., Kadyrova, N. I., Zakharova, G. S., Kuznetsov, M. V., Podval’naya, N. V., Mikhalev, K. N., Zainulin, Yu. G.
Format: Article
Language:English
Subjects:
Anions
Cations
Copper
Electrical resistivity
Inorganic chemistry
Magnetic permeability
Magnetic properties
Perovskites
Raman spectra
Saline solutions
Slaked lime
Spectrum analysis
Stoichiometry
Valence
Water vapor
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Summary:The binding energies and valence state of atoms in the perovskite-like compound CaCu3V4O12 have been determined using XPS spectroscopy. The stoichiometry of this phase is formulated as Ca2+Cu2+Cu2+(V25+V24+O12). Under an air atmosphere, the phase interacts with water vapor and oxygen. As a result, Ca(OH)2 is formed on its surface, the Cu+ and V4+ ion concentrations decrease, and the Cu2+ and V5+ concentrations increase in association. Raman spectra show shortened cation-anion bond lengths and cation-anion-cation bond angles in CaCu3V4O12 compared to perovskite CuVO3; the two structures are alike. The electrical conductivity, magnetic susceptibility, thermal and sensor properties of CaCu3V4O12 in aqueous salt solutions have been studied.
ISSN:0036-0236
1531-8613
DOI:10.1134/S0036023607030060