Pyrochlore based oxides with high dielectric constant and low temperature coefficient
US5658485A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 3, 1995 |
| Grant date | Aug 19, 1997 |
| Priority date | — |
| Expiry date | Oct 3, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/499
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The temperature dependent dielectric constants in the vicinity of room temperature have been measured for bulk ceramics which are phase-mixtures of Pb.sub.2 (Nb,Mg,Ti).sub.2 O.sub.6+x pyrochlores and Pb(Nb,Mg,Ti)O.sub.3 perovskites. A band of compositions has been found in which the negative temperature coefficient of dielectric constant for the pyrochlore is very closely compensated by the positive temperature coefficient of dielectric constant of the perovskite. These compositions have dielectric constants near 200, with Q's near 200 at 1 MHz, making them an intermediate family of dielectrics between the much studied high dielectric constant low Q Barium-Strontium Titanates and low dielectric constant high Q Barium-Lanthanide Titanates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.