Accession Number : AD0749958

Title :   High Temperature IR Glasses.

Descriptive Note : Technical rept. no. 3, 1 Sep 71-31 Aug 72,

Corporate Author : MISSOURI UNIV ROLLA DEPT OF CERAMIC ENGINEERING

Personal Author(s) : Kreidl,Norbert J. ; Anthonis,Henry E. ; Ratzenbock,Werner

Report Date : 31 AUG 1972

Pagination or Media Count : 82

Abstract : 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 Si(35)As(15)Ag(10)Te(20)Se(20) had the viscosity log eta=13 at about 500C, as compared to 370C for the base glass Si(35)As(25)Te(40), the viscosity of log eta=9.8 at about 560C, as compared to 442C for the base glass Si(35)As(25)Te(40). 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)

Descriptors :   (*CERAMIC MATERIALS, PHASE STUDIES), (*INFRARED OPTICAL MATERIALS, PHASE STUDIES), (*INFRARED WINDOWS, CERAMIC MATERIALS), SILICON COMPOUNDS, ARSENIC COMPOUNDS, TELLURIDES, SELENIDES, ARSENIDES, SILVER COMPOUNDS, PHASE DIAGRAMS, MELTING, TABLES(DATA)

Subject Categories : Ceramics, Refractories and Glass
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE