Bi系低温焼結マイクロ波誘電体セラミックス

概要

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We have investigated the substitution of Zn for Ca in Bi2O3-CaO-Nb2O5 system in order to improve the dielectric constant at microwave frequencies. CuO was added to lower sintering temperature. The refined composition was represented as 40.5BiO3/2-23.2(Ca.75 Zn.25)0-36.3NbO5/2 containing 0.2 wt% CuO. This ceramics could be sintered at 925°C and had excellent dielectric properties ; ε=95, Q=660(at 2.9GHz), and τ<SUB>f</SUB>=+1ppm/°C. It is applicable to multilayer microwave devices with Ag Inner conductors.