High Temperature IR Glasses.
Technical rept. no. 3, 1 Sep 71-31 Aug 72,
MISSOURI UNIV ROLLA DEPT OF CERAMIC ENGINEERING
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The introduction of Ag in Si-As-Te glasses permits the incorporation of Se, otherwise volatile and, or degradable as a constituent in Si-containing chalcogenide glasses. Si-As-Ag-Te-Se glasses exhibit much higher softening ranges and glass transition temperatures than encountered in known chalcogenide systems. A glass Si35As15Ag10Te20Se20 had the viscosity log eta13 at about 500C, as compared to 370C for the base glass Si35As25Te40, the viscosity of log eta9.8 at about 560C, as compared to 442C for the base glass Si35As25Te40. Phase separation occurs in the system Si-As-Ag-Te-Se and becomes manifest in two glass transitions indicated by changes in the slopes of the expansion curves and breaks in the softening point-composition relations. The existence and behavior of Si-As-Ag-Te-Se glasses suggests the possible development of higher Tg ir transparencies and higher Tg low band gap semiconductor glasses than described so far. Author
- Ceramics, Refractories and Glass