Electrical conductivity and defect chemistry of the system (TbxGd1−x)2Zr2O7+y (Ox1;Oy<0.25)


Dijk, M.P. van and Vries, K.J. de and Burggraaf, A.J. (1985) Electrical conductivity and defect chemistry of the system (TbxGd1−x)2Zr2O7+y (Ox1;Oy<0.25). Solid State Ionics, 16 . pp. 211-224. ISSN 0167-2738

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Abstract:Structural and electrical properties of the homogeneous solid solution series (TbxGd1−x)2Zr2O7+y (Ox1; O y < 0.25) were investigated. The defect structure and electrical properties were studied by thermogravimetric analysis and electrical conductivity and ionic transport number measurements as a function of temperature and oxygen partial pressure. The (p-type) electronic conductivity was found to arise from a small polaron hopping mechanism on the Tb-sublattice. The charge carrier concentration can be correlated with the Tb4+ concentration. The maximum fraction of Tb4+ ions on the Tb-sublattice was found to be 0.25 and is hardly dependent on the composition (x). Charge carrier mobilities are in the range at 700°C. Ionic conductivities up to 7 × 10−1 ω−1m−1 at 700°C are found. The conductivity can well be described with a previous developed model, that relates the effects of pyrochlore order in the fluorite lattice with the conductivity parameters.
Item Type:Article
Copyright:© 1985 Elsevier Science
Link to this item:http://purl.utwente.nl/publications/69451
Official URL:https://doi.org/10.1016/0167-2738(85)90045-1
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