Temperature Stable Bi_1.3Yb_0.7O₃-BaTiO₃ Relaxor Ferroelectric

Abstract:

A new system, Bi_1.3Yb_0.7O₃-BaTiO₃ was found as a perovskite dielectrics with some advantageous properties. The structure was identified by X-ray diffraction method and SEM was also employed to observe the surface and fracture morphologies. The studies indicate that the relative dielectric constant initially increases and then decreases slightly, the dielectric loss initially decreases and finally close to a stable value. The experimental results reveal that the grain size became smaller initially, then increase after the sample E and finally the sample F had the maximum grain size. Experiments show the system Bi_1.3Yb_0.7O₃-BaTiO₃ can significantly improve the thermal stability of the BaTiO₃ ceramics. Electric hysteresis loop show that the system is relaxor ferroelectric. The samples doped with 20% BiYbO₃ calcined at 750°C for 2h and then sintered at 1280°C for 2h exhibited attractive properties, including high relative dielectric constant (>1000), low dielectric loss (<2.5%), low temperature coefficient of capacitor (<±15%) over a wide temperature range from －55°C to +180°C, satisfying EIA X8R specifications.

• Periodical: Advanced Materials Research (Volumes 415-417)
• Pages: 1046-1050
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.415-417.1046
• Online since: December 2011
• Authors: Jun Ting Qi, Jun Jie Hao, Yun Xia Zhang, Bo Liu, Xiao Jia Wang
• Keywords: Bi_1.3Yb_0.7O₃-BaTiO₃, BiYbO₃, Dielectric Property, Relaxor Ferroelectric, X8R

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