Reactivity of solid BaCe0.9Y0.1O3 towards liquid V2O5

Abstract

In this work the reactivity in solid BaCe0.9Y0.1O3-δ - liquid V2O5 system was investigated in order to evaluate the possibility of composite formation in this system. Impregnation of melted vanadium(V) oxide into solid Y-doped BaCeO3 was performed in various temperature and time conditions. Due to the relatively high reactivity of components in this system an analysis of the synthesized materials was divided into discussion of the properties of the reactive layer and the inner part. As was shown, decomposition of Y-doped BaCeO3 in contact with melted vanadium(V) oxide occurs already at temperature 700 °C and results in formation of CeVO4 as one of the main phases. Moreover, the presence of Ba8V7O22 as the intermediate phase was observed. The extension of reaction time and increase of temperature resulted in significant changes in the microstructure and chemical composition of the reactive layer. The incorporation of vanadium into yttrium doped BaCeO3 structure for inner parts of the synthesized materials was postulated based on the modification of the materials electrical properties and chemical stability towards CO2 and H2O. Also, the presence of additional phase in the intergranular voids of doped-BaCeO3 was suggested.