1 October 1990 Primary and secondary phase separation in GeS2-La2S3 glasses
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Abstract
GeS2 is known to be a good chalcogenide glass former with a transmission cut off at 1 1 . tm and has been studied for its application in the mid infrared region. The rare earth sulfides (La-Er) form reasonably good and stable glasses when mixed with other chalcogenides such as Ga2S3. In this work glass formation was studied in the GeS2- La2S3 system. Two compositions containing 60 mol and 92. 5 mol GeS2 respectively were studied and the effect of composition on the microstructure and thermal stability of these glasses were investigated. Microstructural analyses were performed on the as prepared and heat treated glasses using TEM and SEM/EDXA. Glasses rich in GeS2 exhibited primary (6-80 nm) and secondary (3-13 nm) phase seperation at the molecular level. Differential thermal analysis performed on these glasses indicated glass transition temperatures (Tg) of 590C and 420C for the two compositions studied. The glasses were stable and the (Tg) was observed to decrease with increasing contents of GeS2 in these glasses. 1.
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Prashant N. Kumta, Prashant N. Kumta, Subhash H. Risbud, Subhash H. Risbud, } "Primary and secondary phase separation in GeS2-La2S3 glasses", Proc. SPIE 1327, Properties and Characteristics of Optical Glass II, (1 October 1990); doi: 10.1117/12.22514; https://doi.org/10.1117/12.22514
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