Process for producing ferroelectric crystalline material
US4027074A · kind A · utility
10Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 19, 1974 |
| Grant date | May 31, 1977 |
| Priority date | — |
| Expiry date | Aug 19, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC30B29/34
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Lead germanate, Pb.sub.5 Ge.sub.3 O.sub.11, or lead germanate/silicate in which up to 2/3 on a molar basis of the germanium has been substituted with silicon, can be formed from a glassy state to a ferroelectric state by a simple annealing process. The lead germanate or lead germanate/silicate is heated to a temperature sufficient to anneal it into a crystalline phase, then cooled below the ferroelectric transition temperature for the composition while an electric field is applied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.