Dielectric properties of 0.85Pb(Zn⅓Nb⅔)O3-0.15BaTiO3 -MgF2·SrF2 ceramics

• Published in: Ferroelectrics. Letters section 1998, Vol.24 (3-4), p.69-72
• Main Authors: Yi, Fang Xiang, Jun, Luo Jian, Xiangming, Cheng, Tang, Wu Ming, Xi, Yao
• Format: Article
• Language: English
• Subjects: Capacitor; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Dielectric materials; Dielectric properties of solids and liquids; Dielectric, piezoelectric, ferroelectric and antiferroelectric materials; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Exact sciences and technology; Ferroelectrics; Niobates, titanates, tantalates, pzt ceramics, etc; Permittivity (dielectric function); Physics
• ISSN: 0731-5171; 1563-5228
• DOI: 10.1080/07315179808204458

In order to put the Lead zinc niobate ceramics in practical use for low-temperature sintering multilayer capacitor (MLC), we have managed to reduce the sinter temperature of 0.85PZN-0.15BaTi 3 ceramics by adding small amount of MgF 2 .SrF 2 . The results show that the sintering temperature can be reduced from 1100 °C to 900-950 °C, and meanwhile the dielectric constant versus temperature shows two peaks in the temperature range of -70 °C to 100 °C, near to the X7R character of capacitor. Frequency dispersion and dielectric loss are reduced down dramatically at -70 °C. These phenomena are different from that of typical relaxation ferroelectricity. The unusual dielectric behaviors could be clarified with the idea of superparaeletric state.