Formation of new chalcohalide glasses in GeSe2-Ga2Se3-KI system
Résumé
A new chalcohalide glass system containing higher content of alkali metal ions was developed.Glass samples in the GeSe2-Ga2Se3-KI system were synthesized.The glass-forming region of this system was searched and explained from the theory of lone-pair electrons.The effects of Ga2Se3 and KI on the glass forming ability were discussed.Some properties such as density,char-acteristic temperature,Raman and infrared-visible spectra were presented.The results show that this system has a fairly large glass-forming region,some samples,for example as in molar composition of 50 GeSe2 25Ga2Se3 25KI,have good thermal stability and optical properties,the glass characteristic temperature difference,which expresses the glass thermal stability,is more than 120 K and the transmittance range from 0.59 to 14.2 μm.