Accession Number : ADD018445

Title :   Alkaline Earth Modified Germanium Sulfide Glass.

Descriptive Note : Patent, Filed 28 Feb 95 patented 4 Feb 97,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

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

Report Date : 28 Feb 1997

Pagination or Media Count : 5

Abstract : 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 region of 410-450 deg C.; and thermal stability of 100-300 deg C. based on the difference between and Tg and Tx, comprising, on mol basis, 20-90% germanium sulfide, 0-60% gallium sulfide, and 5-60% of at least one modifier in sulfide form. A process for improving mechanical and optical properties of a sulfide glass based on gallium sulfide and/or germanium sulfide comprises the steps of mixing glass components, including a modifier in elemental or sulfide form; melting the glass components 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 the form of sulfides, and if in elemental form, then sufficient amount of sulfur is added to form sulfides of the glass components.

Descriptors :   *THERMAL STABILITY, *SULFIDES, *PATENTS, *GERMANIUM COMPOUNDS, *OPTICAL GLASS, ANNEALING, COOLING, TRANSMITTANCE, TRANSITION TEMPERATURE, SULFUR, INFRARED RADIATION, HARDNESS, GALLIUM COMPOUNDS, ALKALINE EARTH METALS

Subject Categories : Ceramics, Refractories and Glass
      Infrared Detection and Detectors
      Mechanics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE