The effects of Bi2O3 addition on the microwave dielectric properties and the microstructures of Zn0.95Mg 0.05TiO3 + 0.25TiO2 with 1 wt% 3ZnO-B 2O3 (ZnBO-ZMT) ceramics prepared by conventional solid-state routes have been investigated. In a preliminary study, it was shown that ZnBO-ZMT ceramics can be sintered to a theoretical density higher than 95% at 900°C. In this study, the effects of Bi2O3 additions of up to 10wt% on the sintering characteristics of the ZnBO-ZMT' ceramics was investigated at the sintering temperatures ranging from 860 to 960°C. Sintered ceramic samples were characterized by X-ray diffraction and scanning electron microscopy (SEM). It was found that as the content of Bi 2O3 increases, the density of the sintered ceramics increases, and the sintering temperature can be lowered to 880°C by adding 5 wt% Bi2O3. The ZnBO-ZMT' ceramic with 5wt% Bi 2O3 addition sintered at 880°C exhibits the optimum dielectric properties: Qxf = 4000GHz, εr = 24.6, and τf = -14ppm/°C. Unlike the ZnBO-ZMT' ceramic without Bi 2O3 addition sintered at above 920°C, the ceramics with Bi2O3 additions show no Zn2TiO4 existence at 960°C sintering. It is therefore demonstrated that the addition of Bi2O3 can suppress the formation of Zn 2TiO4 in ZnBO-ZMT' ceramics.
|Number of pages||6|
|Journal||Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers|
|Issue number||4 A|
|Publication status||Published - 2005 Apr 1|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)