Accession Number : AD0447972

Title :   NEW HIGH TEMPERATURE INFRARED TRANSMITTING GLASSES.

Descriptive Note : Summary technical rept., 1 May 62-31 Jul 64,

Corporate Author : TEXAS INSTRUMENTS INC DALLAS

Personal Author(s) : Hilton, A. Ray

Report Date : 31 JUL 1964

Pagination or Media Count : 47

Abstract : Non-oxide glasses made from three elements, one from each of the elemental groups IVA, VA, and VIA, have been under investigation for more than two years for use a/ high temperature infrared window materials. The results obtained in the qualitative evaluation of seven systems are summarized. The Si-As-Te, Ge-As-Te, and Si-GeAs-Te system/ produce glasses which have the best optical properties. The constituent elements are rank ordered as to their ability to form a glass or affect the softening point. Bonding within the glasses is discussed and compared to that in oxide systems. Infrared absorption bands in the 2.5 to 25 micron wavelength range are accounted for in terms of weak overtones of strong absorption bands of constituent atoms or are caused by the absorption of oxides present as impurities in the glasses. Large prisms and plates of some glasses have been made. Precise optical constants obtained from measurements made on prisms of three glasses are given. Future studies will deal with the molecular arrangement of the glasses. (Author)

Descriptors :   *GLASS, *INFRARED OPTICAL MATERIALS, ARSENIC, GERMANIUM, ANTIMONY, SELENIUM, SILICON, SULFUR, TELLURIUM, CHALCOGENS, HARDNESS, THERMAL EXPANSION, DIELECTRIC PROPERTIES, ELECTRICAL RESISTANCE, TENSILE PROPERTIES, REFRACTIVE INDEX, HIGH TEMPERATURE, OPTICAL PROPERTIES, HEAT RESISTANT GLASS.

Distribution Statement : APPROVED FOR PUBLIC RELEASE