25- x Ga x Te 75- y I y Glass System ( x?=?5, 10, 15, y?=?0–6)]]>

摘要

Glasses of Ge25-xGaxTe75-yIysystem with gallium content of 5–15?at.% and iodine of 0–6?at.% have been prepared. The glass transition temperature, crystallization and melting temperature of the samples in the range 100–400?°C were determined by differential scanning calorimetry. In Ge15Ga10Te75-yIysystem, the crystallization stability of glasses is extremely dependent on composition, taking the maximum value for y?=?2; for Ge10Ga15Te75-yIyand Ge25-xGaxTe69I6systems, a monotonous increase in the resistance to crystallization with an increase in the content of iodine and gallium is characteristic. The density of the glasses, measured by the hydrostatic weighing method, decreases with increasing ofy. In view of physicochemical and optical properties among the investigated samples, the glasses of Ge15Ga10Te73I2and Ge10Ga15Te69I6are the most suitable for drawing optical fiber. Optical fibers are manufactured from these glasses by crucible method.