Effect of B2O3 and CuO on the Sintering Temperature and Microwave Dielectric Properties of Ba(Zn1/3Ta2/3)O3 Ceramics

概要

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Sintering temperature of the Ba(Zn1/3Ta2/3)O3 (BZT) ceramic is about 1550°C and it decreased to 950°C when B2O3 was added. The BaB4O7 second phase whose melting temperature is 889°C was found in the B2O3 added BZT ceramics. The BaB4O7 second phase assisted the sintering of the BZT ceramics at 950°C. However, the B2O3 added BZT ceramic was not sintered below 950°C and the microwave dielecric properties were not satisfactory. On the other hand, when the B2O3 and the CuO were added, the BZT ceramic was sintered even at 870°C. The BaCu(B2O5) phase which was found in the CuO and B2O3 added BZT ceramics, existed as the liquid phase during the sintering and helped the densification of the BZT ceramics at temperatures lower than 950°C. Good microwave dielectric properties of $Q\times f=11{,}000$ GHz, $\varepsilon_{\text{r}}=26$ and $\tau_{\text{f}}=0.0$ ppm/°C were obtained from the BZT + 5.0 mol% B2O3 + 10.0 mol% CuO ceramic sintered at 870°C for 2 h.
2005-05-15