Dielectric Relaxation Measurements in La_1.94Ba_0.06Mo_2-yW_yO_9-δ (y=0, 1.0) Oxide-Ion Conductors

Abstract:

The influence of barium doping on the oxygen-ion diffusion and phase transition in the La₂Mo_2-yW_yO_9-δ (y=0, 1.0) oxide-ion conductors has been systematically investigated via dielectric techniques. In the Ba-doped La₂Mo₂O₉ samples there are only two dielectric relaxation peaks P_d1 and P_d2, which are associated with the short-distance diffusion of oxygen vacancies. But in the Ba-doped La₂MoWO₉ members, three peaks are detected, including peak P_d1, P_d2, and peak P_h. The last is associated with the phase transition process from the static disordered state to the dynamic disordered state of oxygen ion/vacancy distribution.

• Periodical: Applied Mechanics and Materials (Volume 662)
• Pages: 20-23
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.662.20
• Online since: October 2014
• Authors: Dan Li*, Bo Wang, Pei Gong, Jie Li, Xiang Hu Li
• Keywords: Dielectric Relaxation, La₂Mo₂O₉, Oxide-Ion Conductor, Phase Transition

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