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The Electrical and Defect Properties of Bi3Zn2Sb3O14 Pyrochlore: A Grain-Boundary Phase in ZnO-Based Varistors

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Abstract

The electrical conductivity of Bi3Zn2Sb3O14 pyrochlore was studied as a function of temperature and partial pressure of oxygen. Conductivity measurements by ac complex impedance analysis and ionic transference number measurements show this pyrochlore to be a mixed ionic-electronic conductor with an energy band gap of 3.15 ± 0.9 eV. A defect model in which Frenkel defects on the oxygen lattice are dominant is confirmed. Enthalpies of reduction, oxidation and the sum of oxygen vacancy formation and migration were found to be 4.82 ± 0.8 eV, 1.48 ± 1.0 eV and 1.67 ± 1.0 eV respectively.

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Authors and Affiliations

  1. Crystal Physics and Electroceramics Laboratory, Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA

    Jane Clayton, Hitoshi Takamura, Harry L. Tuller & Bernhardt J. Wuensch

  2. Laboratoire Hydrazines et Procédés, UCBL-CNRS-SNPE, Bâtiment 731 – Berthelot, 43 Boulevard du 11 Novembre, 69 622, Villeurbanne, France

    Renaud Metz

Authors
  1. Jane Clayton
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  2. Hitoshi Takamura
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  3. Renaud Metz
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  4. Harry L. Tuller
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  5. Bernhardt J. Wuensch
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Clayton, J., Takamura, H., Metz, R. et al. The Electrical and Defect Properties of Bi3Zn2Sb3O14 Pyrochlore: A Grain-Boundary Phase in ZnO-Based Varistors. Journal of Electroceramics 7, 113–120 (2001). https://doi.org/10.1023/B:JECR.0000027951.41051.11

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  • DOI: https://doi.org/10.1023/B:JECR.0000027951.41051.11

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