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Anomalous dielectric behavior in nanocrystalline γ-Fe2O3

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Chinese Science Bulletin

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Abstract

The measurements of electric capacities and dielectric loss angles for nanocrystalline γ-Fe2O3, under air and vacuum atmospheres have been conducted by using ac LRC method, and the conductivity and the polarization relaxation time have also been calculated from the frequency spectra of real and imaginary parts of the dielectric constants. The anomalous dielectric behavior implies the existence of two kinds of polarization mechanisms with different relaxation times, which are caused by the defects and the dangling bonds in the interfaces, respectively. The experimental and calculated results indicated that the polarization loss and the conductance loss are dominant in air atmosphere and vacuum, respectively.

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Authors and Affiliations

  1. Department of Physics, Zhejiang University, 310027, Hangzhou, China

    Xisheng Ye, Jian Sha, Bin Chen & Zhengkuan Jiao

  2. Northwst Institute of Nuclear Technology, 710024, Xi’an, China

    Xisheng Ye

  3. Institute of Theoretical Physics, Chinese Academy of Sciences, 100080, Beijing, China

    Bin Chen

  4. Institute of Solid State Physics, Chinese Academy of Sciences, 230031, Hefie, China

    Lide Zhang

Authors
  1. Xisheng Ye
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  2. Jian Sha
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  3. Bin Chen
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  4. Zhengkuan Jiao
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Ye, X., Sha, J., Chen, B. et al. Anomalous dielectric behavior in nanocrystalline γ-Fe2O3 . Chin. Sci. Bull. 44, 186–189 (1999). https://doi.org/10.1007/BF02884749

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  • DOI: https://doi.org/10.1007/BF02884749

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