Preparation of red amorphous selenium
US4009249A · kind A · utility
14Cited by
2References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 16, 1976 |
| Grant date | Feb 22, 1977 |
| Priority date | — |
| Expiry date | Jan 16, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/60
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Red amorphous selenium is obtained by precipitating selenium from a solution of selenious acid in methanol or ethanol with hydrazine or a soluble salt thereof at a temperature between about -20.degree. C. and the freezing point of the solution. Furthermore, the stable red amorphous selenium may contain a halogen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.