Cerium Oxide Selenides

The finely pulverized dry components were mixed thoroughly in the stoichiometric ratio 42.1 wt% CeOp and 57.9 wt% Se. The mixture was placed in a graphite boat and heated in a porcelain or quartz tube. The tube was flushed with dried and purified Ar and evacuated. As the temperature is raised rapidly, the rate of compound formation and the rate of Se evaporation (up to 900°C) will be greater. The reaction begins gradually above 900°C and practically pure 

Oxidation in air takes place at room temperature and X-ray investigations show that Oe02 and Se are formed, Benacerraf et al. [5]. Oe02 and Se are also formed under the conditions of preparation when the temperature is slowly raised to 1200°C. Raising the temperature rapidly to 1350°C gave CeSe [1,2]. 

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