Non-reducible BaTiO3-based dielectric ceramics for Ni-MLCC synthesized by soft chemical method

• Published in: Ceramics international 2006, Vol.32 (4), p.447-450
• Main Authors: Zhen, Ji, Yue, Zhang, Yousong, Gu, Sen, Wang, Lingfeng, Li, Zhigang, Xiao, Yanbin, Wang
• Format: Article
• Language: English
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Capacitors. Resistors. Filters; Ceramic industries; Chemical industry and chemicals; Electrical engineering. Electrical power engineering; Electrotechnical and electronic ceramics; Exact sciences and technology; Technical ceramics; Various equipment and components
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2005.03.020

A nano-BaTiO3-based non-reducible dielectric material was developed through a soft chemical route. The particle size was decreased down to the level of 30 nm and the dielectric medium could be co-fired with Ni-electrodes under a N2 + H2 reducing atmosphere. XRD, SEM, TEM and volume shrinkage were used to detect the sintering behaviour and microstructural evolution including grain growth, pore formation and body densification. After sintering at 1200 C for 2 h, the dielectric constant was 8800, the dissipation factor was < 2%, the insulation resistance was about 10 exp(12)-10 exp(13) ohm.cm, and the temperature coefficients of capacitance were < 22% and -82% at -30 C and 85 C, respectively. The material is anticipated to be used for Ni-multilayer ceramic capacitors with thin dielectric layers with a Y5V specification in the EIA standard. 6 refs.