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
a School of Physics and Microelectronics, Shandong University, Jinan 250100, China; b College of Material Science and Engineering, Liaocheng University,Liaocheng 252059, China
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.
Received: 23 February 2006
Revised: 08 March 2006
Accepted manuscript online:
Fund: Project supported by the National Nature Science Foundation of China (Grant No 50572056).
Cite this article:
Zhao Ming-Lei (赵明磊), Yi Xiu-Jie (仪修杰), Wang Chun-Lei (王春雷), Wang Jin-Feng (王矜奉), Zhang Jia-Liang (张家良) Diffuse dielectric anomaly of (Na0.5K0.5Bi)0.5TiO3 crystal at high temperature 2006 Chinese Physics 15 1611
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