Microwave Dielectric Properties of Zn0.95Mg0.05TiO3 + 0.25TiO2 Ceramics with 3ZnO–B2O3 Addition

概要

論文の詳細を見る
Boron oxide and zinc oxide (ZnBO) added to dielectric materials have attracted great attention recently because they enable the lowering of the firing temperature. The effects of ZnBO addition up to 2 wt% on the microstructure and microwave dielectric properties of zinc magnesium titanate Zn0.95Mg0.05TiO3 + 0.25TiO2 (ZMT$'$) ceramics were investigated for sintering temperatures ranging from 860° to 940°C. It was found that small amount of added ZnBO (1 wt%) can significantly increase the density and improve the microwave dielectric properties of ZMT$'$ ceramics. Doped ZMT$'$ ceramics can be sintered to a density higher than 95% of the theoretical density at 900°C. A rutile second phase exists in the ZMT$'$ ceramics, and it increases with increasing amount of added ZnBO and sintering temperature. In addition, the Zn2TiO4 spinel phase was observed with a sintering temperature of 920°C. The measured dielectric properties of ZMT$'$ ceramics with 1 wt% ZnBO addition sintered at 900°C for 2 h were $\varepsilon_{\text{r}}=23.6$, $Q\times f=30990$ (at 7.75 GHz) and $\tau_{\text{f}}=-8$ ppm/°C.
2004-11-15