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AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsBarry B. Harbison, Jasbinder S. Sanghera, John A. Moon, Ishwar D. Aggarwal
Estimating the term…
A selenide glass with improved mechanical and optical properties such as ended transmission in the infrared region of radiation having wavelengths beyond 15 microns; Tg in the region of 363.degree.-394.degree. C.; and thermal stability of 85.degree.-145.degree. C. based on the difference between T.sub.g and T.sub.x, comprising, on mol basis, 20-70% germanium selenide, 0.5-25% gallium selenide, indium selenide or mixtures thereof; and 5-50% of at least one alkaline earth in selenide form is described. A process for improving mechanical and optical properties of a selenide glass based on germanium selenide comprises the steps of mixing glass components, including a modifier in elemental or selenide 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 is also described. The glass components can be in elemental form or in the form of selenides, and if in elemental form, then sufficient amount of selenium is added to form selenides of the glass components.
A selenium glass, substantially free of crystallites, comprising on a mol basis, at least 5% of an alkaline earth selenide, from 20 to 70% GeSe.sub.2 and from 0.5 to 25% of a group IIIA selenide selected from gallium selenide, indium selenide, and mixtures thereof;
A process for making selenide glasses substantially free of crystallites comprising the steps of batching the glass components, melting the glass components to form a molten mixture, cooling the molten glass mixture to a solid state, annealing the glass in the solid state, and slowly cooling the annealed glass to about room temperature;
Dependencies are inferred from the claim text.