Dielectric anomalies induced by different mechanisms in Pb(Fe1/2Nb1/2)1-xTixO3 single crystals

Kui Liu; Xinyi Zhang; Shiqiang Wei; H. Oyanagi; Jingzhong Xiao

Dielectric anomalies induced by different mechanisms in Pb(Fe1/2Nb1/2)1-xTixO3 single crystals

Materials Science 2008-12-24 v3

Authors: Kui Liu , Xinyi Zhang , Shiqiang Wei , H. Oyanagi , Jingzhong Xiao

Abstract

We investigated the dielectric properties of Pb(Fe1/2Nb1/2)1-xTixO3 single crystals below room temperature. Two dielectric anomalies were detected in sample A while only one was detected in sample B in the temperature range 90~300 K. A Debye-like relaxation with strong frequency dispersion was detected in both samples. The pre-edge XAFS suggests that this dielectric anomaly is induced by the hopping conductivity between Fe2+ and Fe3+. The EXAFS results give us a clear picture of the local structure of iron ions. The weak frequency dependent dielectric anomaly only observed in sample A is supposed to be due to the dipole glass behavior.

Keywords

dielectric anomalies Pb(Fe1/2Nb1/2)1-xTixO3 single crystals Debye-like relaxation hopping conductivity pre-edge XAFS EXAFS dipole glass

Cite

@article{arxiv.0810.1346,
  title  = {Dielectric anomalies induced by different mechanisms in Pb(Fe1/2Nb1/2)1-xTixO3 single crystals},
  author = {Kui Liu and Xinyi Zhang and Shiqiang Wei and H. Oyanagi and Jingzhong Xiao},
  journal= {arXiv preprint arXiv:0810.1346},
  year   = {2008}
}

Comments

12 pages, 5 figures, 1 table

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