Beads of a polycrystalline alkali-metal or alkaline-earth metal fluoride, their preparation, and their use for preparing optical single crystals
US6726766B2 · kind B2 · utility
1Cited by
11References
26Claims
0Family size
Inventors
Key dates
| Filing date | Aug 22, 2002 |
| Grant date | Apr 27, 2004 |
| Priority date | — |
| Expiry date | Nov 18, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC30B29/12
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention is directed to polycrystalline alkali metal or alkaline earth metal beads, in particular CaF2 beads, having a diameter greater than or equal to 100 &mgr;m, advantageously between 100 &mgr;m and 2 cm, and an apparent density greater than 60%, advantageously at least 90%, of the theoretical density of said fluoride. The invention is also directed to a process for the preparation of the foregoing alkali metal and alkaline earth fluoride beads, and for the preparation of single crystals of said fluorides using the foregoing polycrystalline beads.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.