Abstract
Te 80− x Ge 20Se x glasses have been prepared along the GeSe 4–GeTe 4 axis using the classical method in silica tube under vacuum. A phase separation domain appears for composition around Te 40Ge 20Se 40. Our attention was turned toward the Te-rich compositions corresponding to 1 < x < 5 at.%. These glasses are transparent from 4 to about 20 μm without any purification of the starting elements. Furthermore the difference Δ T between the crystallization temperature T x and the vitreous transition temperature T g lies at about 110 °C that is to say 30 °C higher than for the GeTe 4 reference glass. Finally the introduction of a few percentages of Se makes the glasses much easier to prepare and more stable against crystallization, making them drawable as optical fibers for example. Taking into account their transparency window, encompassing the CO 2 absorption band around 15 μm, the Te 80− x Ge 20Se x with 1 < x < 5 at.% could become matchless composition for the CO 2 infrared detection as planed by the Darwin mission of the European Space Agency.
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