Compensation of the temperature coefficient of the dielectric constant of barium strontium titanate
US5552355A · kind A · utility
5Cited by
1References
4Claims
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Key dates
| Filing date | Oct 3, 1995 |
| Grant date | Sep 3, 1996 |
| Priority date | — |
| Expiry date | Oct 3, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/499
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A decrease in the temperature coefficient of the dielectric constant (TCK) for polycrystalline ceramics of Barium Strontium Titanate (BST) through admixture with tetragonal bronze type Barium Strontium Niobate (BSN) has been found. For Ba.sub.0.5 Sr.sub.0.5 TiO.sub.3 ceramics, a 10% admixture of BSN decreases TCK by a factor of 2.5 at 10 MHz, with negligible degradation of the dielectric loss. A 37.5% admixture of BSN decreases TCK by a factor of more than 100. Dielectric constants for the mixtures are in the range of 200-500.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.