J. Kusinski, G. Petot-Ervas, C. Petot, B. Jouffrey, P. Schattschneider:
"Microstructure and nanochemistry of Ca-doped cobalt oxide single crystals";
Materials Chemistry and Physics, 81 (2003), S. 308 - 311.

Kurzfassung englisch:
Microstructure and nanochemistry of Ca-doped cobalt oxide single crystals

J. Kusinski [Corresponding Author Contact Information] , [E-mail The Corresponding Author] , a, G. Petot-Ervasb, C. Petotb, B. Jouffreyc and P. Schattschneiderd

a Engineering Faculty of Metallurgy and Materials, University of Mining and Metallurgy, 30 Mickiewicza Ave., 30059, Cracow, Poland
b CNRS/UMR 8580, SPMS, Ecole Centrale Paris, 92295, Châtenay-Malabry, France
c CNRS/UMR, MSSMat, Ecole Centrale Paris, 92295, Châtenay-Malabry, France
d TU Wien/EO52, Wiedner Hauptstr. 8-10, A-1040, Wien, Austria

Available online 14 January 2003.


Ca-doped (1; 1.7; 5 and 10 mol% CaO) cobalt oxide single crystal samples, having an [1 0 0] orientation, were annealed at 1100 °C in air or argon atmosphere. The microstructure was examined by means of transmission electron microscopy (TEM). The electron energy loss spectroscopy (EELS) analysis of the matrix and precipitates has been performed in order to understand the conductivity behavior of these materials. An extensive precipitation of Ca-free Co3O4 spinel crystals was observed with increasing Ca content and oxygen activity. It is suggested that the electrical conductivity changes in this material may be related to this precipitation, because it changes the electronic state of cobalt cations.

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