Accession Number : AD0767783

Title :   High Temperature IR Glasses.

Descriptive Note : Technical rept. no. 4 (Final), 1 Sep 72-31 Aug 73,

Corporate Author : MISSOURI UNIV ROLLA DEPT OF CERAMIC ENGINEERING

Personal Author(s) : Kreidl,Norbert J.

Report Date : 31 AUG 1973

Pagination or Media Count : 49

Abstract : Glasses in the system Si-As-Ag-Te-Se were found to have much higher softening temperatures than any chalcogenide glasses previously investigated. One heat treated glass had a softening temperature of 670C, which is 220 degrees higher than that of the Si-As-Se base glass. Ir transmission in relevant ranges was essentially maintained. Ag is instrumental in allowing the introduction of Se otherwise rejected in silicon chalcogenide glasses. The development of microstructure is more important than the intended increase in average bonding by the substitution of Se for Te. The microstructure involves glass-glass phase separation, with one of the phases having a much higher Tg, and, possibly, some microcrystallinity. (Modified author abstract)

Descriptors :   (*CERAMIC MATERIALS, PHASE STUDIES), (*INFRARED OPTICAL MATERIALS, PHASE STUDIES), (*INFRARED WINDOWS, CERAMIC MATERIALS), SILICON COMPOUNDS, ARSENIC COMPOUNDS, SILVER COMPOUNDS, ARSENIDES, TELLURIDES, SELENIDES, INFRARED SPECTROSCOPY, DENSITY, CRYSTALLIZATION, INTERNAL FRICTION, MICROSTRUCTURE, PHASE DIAGRAMS

Subject Categories : Ceramics, Refractories and Glass
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE