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 2wt% 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 Zn 2TiO4 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 2h were εr = 23.6, Q × f = 30990 (at 7.75 GHz) and τ f = -8ppm/°C.
|Number of pages||4|
|Journal||Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers|
|Issue number||11 A|
|Publication status||Published - 2004 Nov 1|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)