The crystallization of vitreous compounds As
2 (Se
1-XTe
X)
3 (X=1/4, 1/3, 1/2, 2/3, 3/4) was investigated in the temperature range from 150°C to 300°C by the use of microscopic, electrical and X-ray diffraction methods. From the microscopic observation, it was found that at the early stage of crystallization, nuclei appeared on the surface of the specimen and grew into the specimen in the form of a layer. During on the final stage, other nuclei appeared inside the specimen and grew spherically with the same linear crystallization rate as that of surface nuclei, and thus completed the crystallization of the whole specimen. From the temperature dependence of linear growth rate, the activation energy for the crystallization is found to be nearly the same in the wide composition range studied : namely, 1.4±0.2 eV. From electrical and X-ray studies, specimens were known to crystallize into two different crystal structures: the high temperature phase and the low temperature phase, bordered by a critical temperature. The specimen crystallized into a mixed structure of both phases near the critical temperature.
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