ADDITIVE FOR DIELECTRIC CERAMIC FOR MICROWAVE, DIELECTRIC CERAMIC COMPOSITION FOR MICROWAVE, AND METHOD OF MANUFACTURING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a dielectric ceramics composition for microwave having excellent dielectric characteristics and anisotropy, and a method of manufacturing the same.

SOLUTION: The acicular crystal of a tungsten bronze-type solid solution expressed by a general formula, Ba6-3xR8+2xTi18O54(where, R is at least one element selected from La, Pr, Nd, Sm, Eu, and Gd; 0.5≤x≤0.7) has excellent dielectric characteristics and a distinctive property of anisotropy originating from the form of the acicular crystal. Then, the acicular crystal of the tungsten bronze-type solid solution can be used as an additive for dielectric ceramics for microwave to give the dielectric characteristic to various materials. As a result, the dielectric ceramics composition for microwave having excellent dielectric characteristics and anisotropy is provided. Particularly by mixing the acicular crystal with a polycrystalline tungsten bronze-type solid solution having the same composition, the temperature coefficient (τf) is controlled nearly to 0 ppm/°C while keeping the specific dielectric constant εrand the quality factor Q×f.

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