ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 53, (1) 5 - 8 (2009)


LOW-TEMPERATURE SINTERING AND MICROWAVE DIELECTRIC PROPERTIES OF (Zn0.65Mg0.35)TiO₃-CaTiO₃ CERAMICS WITH H₃BO₃ ADDITION
 
Yuan Ying, Zhang Shuren, Zhou Yiaohua, Xiang Longcheng
 
State key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, People’s Republic of China

Keywords: ZnTiO₃, MgTiO₃, Low temperature sintering, Microwave ceramics
 

Low-melting H₃BO₃, acting as sintering aid, was used to reduce the sintering temperature of 5 wt.% CaTiO₃-doped (Zn0.65Mg0.35)TiO₃ ceramics. The sintering behaviors, microstructures and microwave dielectric properties with different amounts of H₃BO₃ addition were investigated. The results showed that H₃BO₃ additive was very effective for lowering the sintering temperature and improving the bulk density during sintering. This was due to the promotion of liquid-phase sintering. In the case of 0.25 wt.% H₃BO₃ addition, fine-grained structure was observed, whereas abnormal grain growth was occurred when 3 wt.% H₃BO₃ was doped. It was found that the addition of H₃BO₃ improved the dielectric constant (εr) and quality factor (Q × f) .When 5 wt.% CaTiO₃ and 3 wt.% H₃BO₃ were added, the (Zn0.65Mg0.35)TiO₃ ceramics could be sintered at 950~1000°C and showed excellent microwave dielectric properties: ε ≈ 20, Q × f > 48000 GHz (at 8 GHz) and τf ≈ 5 ppm/°C.


PDF (1.1 MB)
 
Licence Creative Commons © 2015 - 2024
Institute of Rock Structure and Mechanics of the CAS & University of Chemistry and Technology, Prague
Webmaster | Journal Contact