Abstract
The Ga20Ge20Se60 chalcogenide glass-ceramics with a crystalline phase volume fraction of 50–55%, an average crystal size of 2–5 μm, and a transparency of 50–65% in the spectral range of 7–16 μm (at 2 mm sample thickness) are prepared. The features of phase formation during glass-forming melt quenching and subsequent annealing are studied. In samples quenched in water from 750 to 850 °C, Ga40-xGexSe60 (x = 20–30) solid solutions with a cubic unit cell are formed. Upon quenching from 700 °C, solid solutions isostructural to monoclinic Ga2Se3 are formed. Annealing of glass-ceramics at 480 °C leads to the decomposition of the cubic phase and the appearance of mixed GaGeSe3. Fracture toughness, elastic modulus, and abrasive resistance increase with increasing gallium content in GaxGe40-xSe60 (x = 5–20) samples. The reasons for the high transparency of Ga20Se20Se60 glass-ceramics in the long-wave infrared range and its dependence on the production conditions are established and discussed.
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