Process for the manufacture of polycrystalline garnet and corresponding monocrystal
US4350559A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 1980 |
| Grant date | Sep 21, 1982 |
| Priority date | — |
| Expiry date | Nov 7, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/50
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for the manufacture of a polycrystalline garnet and to the corresponding monocrystal. The process comprises the following steps: PA1 (1) a solution containing the salts of the constituent cations of the garnet, in the proportions corresponding to the composition of the latter, is prepared; PA1 (2) corresponding hydroxides are co-precipitated by means of a base in order to obtain a co-hydroxide; PA1 (3) if appropriate, the co-hydroxide is left to age; PA1 (4) it is filtered off; PA1 (5) it is washed; PA1 (6) it is dried; and PA1 (7) it is then calcined at a temperature above the temperature for the formation of the desired garnet structure. The monocrystals obtained by Czochralski drawing of the polycrystalline garnets of the invention can be used, in particular, as substrates in magnetic bubble memory devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.