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Synthesis, X-ray diffraction analysis, and transport properties of Bi 5−x LnxNbO 10 (Ln = La, Gd, and Y) oxide-ion conductors

Abstract : The effects of partial substitutions of Bi by La, Gd, and Y on the structure, thermal expansion and transport properties of modulated fluorite-type Bi5NbO10 were investigated using X-ray thermodiffraction, alternative current impedance spectroscopy and the Wagner polarization method. Through conventional solid-state syntheses, the solid solutions Bi52xLnxNbO10 exist up to about x = 0.25 for La, and to x = 0.5 for Gd and Y. A doubling of their thermal expansion coefficient is observed above 540°C. The type-II incommensurate modulation of these phases is correlated to the nature and amount of substitute, and disappears above 800°C. Except for Bi5NbO10, which appears to be a pure ionic conductor, most of the solid solutions exhibit mixed conductivity with predominant ionic transport. Partial Gd and Y substitutions favor electron conductivity in the low temperature range, probably due to bismuth partial oxidation.
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https://hal-univ-lemans.archives-ouvertes.fr/hal-02135002
Contributeur : Gwenaël Corbel <>
Soumis le : lundi 20 mai 2019 - 21:39:31
Dernière modification le : jeudi 29 août 2019 - 10:08:01

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Xian-Ping Wang, Gwenaël Corbel, Qian-Feng Fang, Philippe Lacorre. Synthesis, X-ray diffraction analysis, and transport properties of Bi 5−x LnxNbO 10 (Ln = La, Gd, and Y) oxide-ion conductors. Journal of Materials Chemistry, Royal Society of Chemistry, 2006, 16 (16), pp.1561-1566. ⟨10.1039/b516591a⟩. ⟨hal-02135002⟩

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