Temperature stable dielectric composition at high and low frequencies
AssigneeTam Ceramics, Inc.
InventorScott S. Campbell
Life of this patent
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Abstract
The invention is directed to a dielectric ceramic having a dielectric constant K, greater than 35, a quality factor, Q, greater than 9,000 at 4 GH.sub.z and a reduction of the firing temperature to less than about 1350.degree. C. The dielectric ceramic consists essentially of a sintered mixture of about 35 to 55 mole percent ZrO.sub.2, about 30 to 50 mole percent TiO.sub.2, 5 to about 22.5 mole percent SnO.sub.2, about 0.5 to 10 mole percent ZnO, and 0.3 to about 2.5 mole percent CuO.
Claims18
A dielectric ceramic having a K value in the range of about 25 to 40, Q greater than about 9000 at 4 GH.sub.z consisting essentially of a mixture of about 35 to 55 mole percent of ZrO.sub.2, about 30 to 50 mole percent of TiO.sub.2, about 5 to 22.5 mole percent of SnO.sub.2, about 0.5 to 10 mole percent of ZnO, and about 0.3 to 2.5 mole percent of CuO;
- sintered at less than about 1350.degree. C.
A multilayer ceramic capacitor consisting essentially of a sintered mixture of about 35 to 55 mole percent ZrO.sub.2, about 30 to 50 mole percent TiO.sub.2, about 5 to 22.5 mole percent SnO.sub.2, about 0.5 to 10 mole percent ZnO, and about 0.3 to 2.5 mole percent CuO.
A composition for making dielectric ceramics useful at about 1 KHz to about 15 GHz consisting essentially of about 35 to 55 mole percent of ZrO.sub.2, about 30 to 50 mole percent of TiO.sub.2, about 5 to 22.5 mole percent of SnO.sub.2, about 0.5 to 10 mole percent of ZnO, and about 0.3 to 2.5 mole percent of CuO.
A method of manufacturing a dielectric ceramic having a K value in the range of about 25 to 40, a Q greater than about 9,000 at 4 GHz comprising the steps of:
- (a) preparing a mixture of high purity oxides consisting essentially of about 35 to 55 mole percent of ZrO.sub.2, about 30 to 50 mole percent of TiO.sub.2, about 5 to 22.5 mole percent of SnO.sub.2, about 0.5 to 10 mole percent ZnO, and about 0.3 to 2.5 mole percent CuO;
- (b) calcining said mixture at a temperature to initiate formation of a base ceramic solid solution phase;
- (c) reducing the particle size of the calcined mixture;
- (d) pulverizing said powdered composition;
- (e) compressing said calcined mixture in a mold;
- and
- (f) firing said compressed powdered composition in air at a temperature less than about 1350.degree. C.
Dependencies are inferred from the claim text.