Abstract
X-ray studies of the stoichiometrically prepareda-Ga2Se3 and Ga2Te3 are reported after various stages of air-oxidation in the temperature ranges 250 to 825° C and 250 to 650° C respectively. Diffractometric powder data of Ga2Te3 are also reported over the complete 2ϑ range with remarkable difference in the relative intensities of the (444) and (642) reflections. Ina-Ga2Se3 the oxidation proceeds by formation of the most stable phase, beta-gallium sesquioxide, complete oxidation occurring at 650° C. For Ga2Te3 a mixture of Ga2TeO6 and TeO2 is obtained as the intermediate oxidation products in the range 500 to 600° C, while at 450° C some extra lines which could be indexed on the super-lattice cell of Ga2Te3, along with Te and unchanged Ga2Te3 lines, are observed. Oxidation at the higher temperature of 650° C led to the disappearance of TeO2 lines leaving Ga2TeO6 as the final well-crystallised phase.
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Mukherjee, A.K., Dhawan, U., Kundra, K.D. et al. X-ray study of the air-oxidiseda-Ga2Se3 and Ga2Te3 powders. Bull. Mater. Sci. 2, 55–60 (1980). https://doi.org/10.1007/BF02748535
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DOI: https://doi.org/10.1007/BF02748535