Low-Firing and Microwave Dielectric Properties of Ba2Ti9O20 with BaO–B2O3–ZnO Glass Addition

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A low-firing ceramic material was fabricated by sintering a mixture of Ba2Ti9O20 with a BaO–B2O3–ZnO (BBZ) glass between 880 and 940 °C for 2 h, and the effects of BBZ glass additives on the sintering behavior and microwave dielectric properties were investigated. The results of this show that as the content of glass increased, the sintering temperature of material decreased. The material can be fully sintered at 900–920 °C with glass additives higher than 15 wt %. Two main crystalline phases, Ba2Ti9O20 and BaTi(BO3)2, were found in the ceramics, and the latter was formed by the reaction between Ba2Ti9O20 and the BBZ glass. The dielectric constant $\varepsilon_{\text{r}}$ and the temperature coefficient of resonant frequency $\tau_{\text{f}}$ decreased and quality factor $Q\times f$ increased as the content of glass additive increased; ceramics containing 20 wt % BBZ glass additive sintered at 900 °C had $\varepsilon_{\text{r}}=26.6$, $Q\times f=11952$ GHz, $\tau_{\text{f}} =-6.6$ ppm/°C.
2008-09-25