中国物理B ›› 2006, Vol. 15 ›› Issue (7): 1611-1614.doi: 10.1088/1009-1963/15/7/039

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Diffuse dielectric anomaly of (Na0.5K0.5Bi)0.5TiO3 crystal at high temperature

仪修杰1, 赵明磊2, 王春雷2, 王矜奉2, 张家良2   

  1. (1)College of Material Science and Engineering, Liaocheng University,Liaocheng 252059, China; (2)School of Physics and Microelectronics, Shandong University, Jinan 250100
  • 收稿日期:2006-02-23 修回日期:2006-03-08 出版日期:2006-07-20 发布日期:2006-07-20
  • 基金资助:
    Project supported by the National Nature Science Foundation of China (Grant No 50572056).

Diffuse dielectric anomaly of (Na0.5K0.5Bi)0.5TiO3 crystal at high temperature

Zhao Ming-Lei (赵明磊)a, Yi Xiu-Jie (仪修杰)b, Wang Chun-Lei (王春雷)a, Wang Jin-Feng (王矜奉)a, Zhang Jia-Liang (张家良)a   

  1. a School of Physics and Microelectronics, Shandong University, Jinan 250100, China; b College of Material Science and Engineering, Liaocheng University,Liaocheng 252059, China
  • Received:2006-02-23 Revised:2006-03-08 Online:2006-07-20 Published:2006-07-20
  • Supported by:
    Project supported by the National Nature Science Foundation of China (Grant No 50572056).

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摘要： This paper investigates the dielectric properties of (Na0.5K0.5Bi)0.5TiO3 crystal at intermediate frequencies (1kHz \le f \le 1MHz) in the temperature range of 30--560℃. A pronounced high-temperature diffuse dielectric anomaly has been observed. This dielectric anomaly is shown to arise from a Debye-like dielectric dispersion that slows down following an Arrhenius law. The activation energy Er obtained in the fitting process is about 0.69eV. It proposes that the dielectric peak measured at low frequency above 400℃ is not related to the phase transition but to a space-charge relaxation.

关键词: dielectric properties, Debye relaxation, space-charge

Abstract: This paper investigates the dielectric properties of (Na0.5K0.5Bi)0.5TiO3 crystal at intermediate frequencies (1kHz $\leq$ f $\leq$ 1MHz) in the temperature range of 30--560℃. A pronounced high-temperature diffuse dielectric anomaly has been observed. This dielectric anomaly is shown to arise from a Debye-like dielectric dispersion that slows down following an Arrhenius law. The activation energy $E_{\tau}$ obtained in the fitting process is about 0.69eV. It proposes that the dielectric peak measured at low frequency above 400℃ is not related to the phase transition but to a space-charge relaxation.

Key words: dielectric properties, Debye relaxation, space-charge

中图分类号:  (Permittivity (dielectric function))

  • 77.22.Ch
77.22.Gm (Dielectric loss and relaxation)