Broadband Dielectric Spectroscopy Analysis of Dielectric Properties of Barium Titanate Ceramics

Abstract:

The complex dielectric behaviors of ferroelectric barium titanate (BT) ceramics were investigated. The dielectric properties were studied as a function of temperature and frequency using broadband dielectric spectrometer. The results show that the maximum value of dielectric constant occurs at 500nm BT ceramics, which is approximately 7,500; the dielectric loss is lower than 0.03 with the temperature varying from 225 K to 450 K. Dielectric constant and dielectric loss experience three dielectric peaks corresponding to rhombohedral to orthorhombic, tetragonal and cubic transitions. With the frequency ranges from 1 MHz to 1 GHz, the dielectric relaxation is apparently present. The relaxation process obeys Cole-Cole relaxation model at high temperature and conforms to Debye relaxation model when the temperature far lower than Curie temperature. The relaxation time is the order magnitude of ~10^-9 s obtained by Havriliak-Negami function fitting, which is very consistent with theoretical calculation.

• Periodical: Advanced Materials Research (Volume 744)
• Pages: 323-328
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.744.323
• Online since: August 2013
• Authors: Jie Yang, Xiang Yun Deng, Jian Bao Li, Qiang Cai, Hai Tao Zhang, Li Ming Wang, Kui Fan Su, Guo Qing Zhang, Chun Peng Wang
• Keywords: Barium Titanate Ceramics, Broadband Dielectric Spectrometer, Debye Cole-Cole Relaxation Mechanism, Dielectric Behaviors, Havriliak-Negami Function

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