Influence of Ca content and oxygen partial pressure on microstructural evolution of (Co,Ca)O at elevated temperatures Author(s): Kusins - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Microscopy Année : 2006

Influence of Ca content and oxygen partial pressure on microstructural evolution of (Co,Ca)O at elevated temperatures Author(s): Kusins

Résumé

Ca-doped (1, 1.7, 5 and 10 mol% CaO) cobalt oxide single-crystal samples, with an [001] orientation, were annealed at elevated temperatures of 1000-1200 degrees C for different times and at different oxygen partial pressures. The microstructure was examined by means of transmission light and electron microscopy. High-temperature X-ray diffractometry was used, with the aim of determining the temperature of the CoO Co3O4 transition in these materials. 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.
Fichier non déposé

Dates et versions

hal-00133288 , version 1 (25-02-2007)

Identifiants

Citer

Gianguido Baldinozzi, Georgette Petot-Ervas, J. Kusinski, L. Cieniek, Claude Petot. Influence of Ca content and oxygen partial pressure on microstructural evolution of (Co,Ca)O at elevated temperatures Author(s): Kusins. Journal of Microscopy, 2006, 224, pp.30-33 Part 1. ⟨10.1111/j.1365-2818.2006.01650.x⟩. ⟨hal-00133288⟩
126 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More