Abstract
A comprehensive study of the crystallization of GaxGe100-x-ySey (x = 0–30; y = 60–75) glasses by means of differential scanning calorimetry, X-ray diffraction analysis, optical microscopy and scanning electron microscopy as carried out. Glass transition temperature and stability against crystallization decrease with increasing gallium content in the glasses. During the glass crystallization, phases of variable composition, isostructural to the polymorphic modifications of Ga2Se3, are formed. Samples with ≤10 at.% gallium content contain germanium mono- and diselenide phases. A distinctive feature of the crystallization of GaxGe100-x-ySey glasses is the formation of globules – localized 10–60 µm sized regions with an increased crystalline phase content. The formation of globules at the stage of melt quenching determines the microscopic structure of glasses. Among the studied compositions, glasses with a selenium content of 60 at.% and gallium content up to 15 at.% are recommended as optimum for the preparation of IR glass-ceramic materials.
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