Synthesis and microwave dielectric properties of CaO-MgO-SiO2 submicron powders doped with Li2O-Bi2O3 by sol-gel method |
| |
| Authors: | Huan-ping Wang Shi-qing Xu Qi-long Zhang |
| |
| Affiliation: | a College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, China
b College of Materials Science and Chemical Engineering, Zhejiang University, Hangzhou 310027, China |
| |
| Abstract: | Using Ca(NO3)2·4H2O, Mg(NO3)2·6H2O, Si(OC2H5)4, LiNO3 and Bi(NO3)3·5H2O as raw materials, CaO-MgO-SiO2 submicron powders were prepared at low temperature by sol-gel method. The crystallization temperature was decreased enormously by the introduction of Li-Bi liquid phase sintering aids into Ca-Mg-Si sol, and the powders with average particle sizes of 80-100 nm and 200-400 nm were obtained at the calcining temperature of 750 °C and 800 °C, respectively. The sintering characteristic and dielectric properties of powders calcined at 750 °C with different content of powders calcined at 800 °C were studied. When the content of powders calcined at 800 °C was 10 wt%, the dielectric ceramic sintered at 890 °C had compact structure, and possessed excellent microwave dielectric properties: ?r = 7.16, Q × f = 25630 GHz, τf = −69.26 ppm/°C. |
| |
| Keywords: | A Ceramics B Chemical synthesis B Sol-gel chemistry D Dielectric properties |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
