(Li, Na, K)(Nb, Ta) O3 based piezoelectric material
US7893601B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 10, 2008 |
| Grant date | Feb 22, 2011 |
| Priority date | — |
| Expiry date | Apr 9, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/42
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Manufacturing sintered bodies having microstructures including microscopic grains having a grain diameter of less than 5 μm, intermediate grains having a grain diameter of 5 μm or more and less than 15 μm, and coarse grains having a grain diameter of 15 μm or more and 100 μm or less enables to obtain high electric characteristics. Chemical compounds including metal elements are mixed so that the ratio of the elements is a composition expressed by (Li, Na, K)(Nb, Ta)O3, the mixture is calcined and crushed to obtain calcined/crushed powder. The powder is sintered in a constant temperature keeping process wherein temperature is kept constantly at a predetermined temperature within a range from 800 to 900° C. for a predetermined period of time in a heating process, and then the powder is further sintered by raising temperature to firing temperature, thereby the piezoelectric materials having superior electric characteristics are manufactured.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.