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Pseudo-relaxor behavior in 0.35La(2)O(3)-0.65Nb(2)O(5) glass prepared by aerodynamic levitation method

Authors
  • Zhang, Zhanpei
  • Li, Haibo
  • Wang, Chunchang
  • Li, Jianqiang
  • Ma, Xiaoguang
Publication Date
Jun 01, 2016
Source
Institutional Repository of Institute of Process Engineering, CAS (IPE-IR)
Keywords
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Abstract

0.35La(2)O(3)-0.65Nb(2)O(5) glasses were prepared by aerodynamic levitation method. The dielectric properties of the sample were investigated as a function of temperature (30-700 degrees C) in the frequency range from 100 Hz to 1 MHz. The glasses show a temperature and frequency-independent dielectric constant of 40 below 200 degrees C. A relaxor-like behavior was observed above 200 degrees C, which was found to be composed of two relaxations with the activation energy of 1.32 eV and 1.3 eV for the low- and high temperature relaxations, respectively. Impedance analysis reveals that the low-temperature relaxation is a conduction relaxation associated with hopping motion of oxygen ions and the high-temperature one is a Maxwell-Wagner relaxation associated with phase boundary. The relaxor-like behavior is attributed to the combining effect of both relaxations. (C) d2016 Elsevier Ltd. All rights reserved.

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