Alkaline earth modified germanium sulfide glass
US5599751A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 1995 |
| Grant date | Feb 4, 1997 |
| Priority date | — |
| Expiry date | Feb 28, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S501/904
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A sulfide glass with improved mechanical and optical properties such as ended transmission in the infrared region of radiation having wavelengths of up to about 15 microns; Tg in the region of 410.degree.-550.degree. C.; and thermal stability of 100.degree.-300.degree. C. based on the difference between T.sub.g and T.sub.x, 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.