Accession Number : ADD017802

Title :   Modified Germanium Sulfide Glass.

Descriptive Note : Patent Application, Filed 10 Oct 95,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Harbison, Barry B ; Jewell, John M ; Aggarwal, Ishwar D ; Merzbacher, Celia

PDF Url : ADD017802

Report Date : 10 Oct 1995

Pagination or Media Count : 31

Abstract : A preferred embodiment of a sulfide glass with improved mechanical and optical properties such as extended transmission in the infrared region of radiation having wavelengths of up to about 15 microns, Tg in the range of 370-550 deg C, and thermal stability of 100-300 deg C, containing, on mol basis, 36-72% germanium sulfide, 2-38% gallium sulfide and/or indium sulfide, and 26-62% of at least one modifier containing an alkaline earth sulfide. A process for making glass of improved mechanical and optical properties comprises the steps of mixing glass components, including an alkaline earth modifier in elemental or sulfide form; melting the glass components in an inert vessel contained in a sealed ampoule to form a molten mixture; cooling the molten glass mixture to a solid state; annealing the solid glass; and cooling the annealed glass to about room temperature. The glass components can be in elemental form or in sulfide form, and if in elemental form, then sufficient amount of sulfur is added to form sulfides of the glass components. jg p25

Descriptors :   *PATENT APPLICATIONS, *MODIFICATION, *GLASS, *GERMANIUM, *SULFIDES, OPTICAL PROPERTIES, ANNEALING, MECHANICAL PROPERTIES, MELTS, THERMAL STABILITY, SOLIDS, COOLING, ROOM TEMPERATURE, MIXTURES, TRANSMITTANCE, GALLIUM, SULFUR, INERT MATERIALS, INFRARED RADIATION, INDIUM, ALKALINE EARTH COMPOUNDS, SOLID STATE CHEMISTRY

Subject Categories : Ceramics, Refractories and Glass
      Inorganic Chemistry
      Physical Chemistry
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE