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Phase transition process in oxide-ion conductor β-La2Mo2−xWxO9 assessed by internal friction method

X. Wang 1 D. Li 2 Q. Fang 1 Z. Cheng 1 Gwenaël Corbel 3 P. Lacorre 3
1 Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences
2 Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences
3 UM - Le Mans Université
Abstract : The oxygen ion diffusion and phase transition in La2Mo2−xWxO9 x=0, 0.25, 0.75, 1.0, and 1.4 have been investigated by the internal friction method. In addition to the low-temperature relaxation peak associated with oxygen ion diffusion, an internal friction peak of phase transition type is observed around 350 °C in all tungsten substituted La2Mo2O9 compounds. Based on the behavior of this peak and the ionic conduction properties, the mechanism of this peak is suggested to be associated with a transition from static disordered state to dynamic disordered state of oxygen ion distribution in anion sublattice that most probably results in a transition of the ionic conduction from the Arrhenius type to the Vogel-Tamman-Fulcher type.
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https://hal-univ-lemans.archives-ouvertes.fr/hal-02135008
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Soumis le : lundi 20 mai 2019 - 21:47:26
Dernière modification le : lundi 8 novembre 2021 - 16:26:05

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X. Wang, D. Li, Q. Fang, Z. Cheng, Gwenaël Corbel, et al.. Phase transition process in oxide-ion conductor β-La2Mo2−xWxO9 assessed by internal friction method. Applied Physics Letters, American Institute of Physics, 2006, 89 (2), pp.021904. ⟨10.1063/1.2220056⟩. ⟨hal-02135008⟩

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