Influences of temperature and atmosphere on thermal stability of BaCrO.

In this article, the influences of temperature and atmosphere on thermal stability of BaCrO were investigated. BaCrO powders with an orthorhombic structure were synthesized by a facile aqueous solution route. The synthesized BaCrO products were then heat treated at different atmospheres to evaluate their thermal stability by differential thermal analysis-thermogravimetry (DTA-TG), X-ray photoelectron spectroscopy and X-ray diffraction. BaCrO has a good thermal stability and does not decompose in air up to 1,400 °C. However, the decomposition of BaCrO in vacuum depends mainly upon a two-stage chemical reaction. BaCrO is finally decomposed into BaCrO with trivalent Cr cations and Ba(Cr Cr)O with both pentavalent Cr and hexavalent Cr cations after heat treatments in vacuum. [ABSTRACT FROM AUTHOR]