Thermal characterization and compatibility studies of perovskite-type Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) oxide with Cr2O3 at high temperature

Abstract

The chemical compatibility of perovskite-type Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) oxides with Cr2O3 has been examined between room temperature and 1,100 A degrees C. Differential thermal analysis and thermogravimetric analysis were used to analyze the thermal behavior of BSCF-Cr2O3 binary mixtures in all composition ranges (0-100 mass% BSCF). The reaction products were identified by X-ray analysis after heating at 700-1,100 A degrees C. As we expected, it was found that perovskite-type BSCF oxide had a poor chemical compatibility with the Cr2O3 oxide. In particular, the decomposition process of the BSCF-Cr2O3 binary mixture is quite complex and it starts at about 700-750 A degrees C. The mixtures of BSCF and Cr2O3 oxides reacted forming mixed complex oxides based on (Ba/Sr)FeO3, (Co/Fe)CrO4, and (Ba/Sr)CrO4 mixtures.