Effect of CuO Additives on Sintering and Microwave Dielectric Behaviors of 0.95Ba(Zn1/3Nb2/3)O3–0.05BaZrO3 Ceramics

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Microwave dielectric properties of the complex perovskite compound CuO-doped 0.95Ba(Zn1/3Nb2/3)O3–0.05BaZrO3 ceramics have been investigated using the conventional solid state method. Copper oxide effectively lowers the sintering temperature of 0.95Ba(Zn1/3Nb2/3)O3–0.05BaZrO3 ceramics as a sintering aid. Ordering of structures was not observed at sintering temperatures from 1240 to 1360°C. The dielectric constant ($\varepsilon_{\text{r}}$) saturated at a value of 38–40 from 1270 to 1360°C. The $Q\times f$ values of 15000–70000 (at 7 GHz) can be obtained in all cases when the sintering temperatures are in the range of 1240–1360°C. The temperature coefficient of the resonant frequency $\tau_{\text{f}}$ was independent of the sintering temperature. An $\varepsilon_{\text{r}}$ value of 39.7, a $Q\times f$ value of 70000 (at 7 GHz), and a $\tau_{\text{f}}$ value of 17 ppm/°C were obtained for 1 wt % CuO-doped 0.95Ba(Zn1/3Nb2/3)O3–0.05BaZrO3 ceramics sintered at 1360°C for 2 h.
2005-11-15