Phase transitions and electrical conductivity of Bi-doped La2Mo2O9 oxide ion conductorsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:La2-xBixMo2Oy (x=0, 0.02, 0.03, 0.04, 0.05, 0.06, 0.08, 0.1, 0.16, 0.24, 0.3) ceramic samples have been characterized by X-ray diffraction, differential scanning calorimetry (DSC) and conductivity measurements in order to assess the dynamics of the transitions between the low-temperature (alpha), high-temperature (beta) and metastable (beta(ms)) phases. Bi doping to x >= 0.05 fully stabilizes the cubic phase, suppressing the beta -> alpha phase transition. In addition, DSC results demonstrate that considerable doping levels give rise to a small thermal event between 450 and 500 degrees C, which has been identified as the beta(ms) -> beta phase transition between cubic phases with static and dynamic oxygen disorder. In this temperature range, the conductivity of the doped materials experiences a transition from Arrhenius to Vogel-Tammann-Fulcher behaviour. Low bismuth concentrations have a significant effect on the conductivity of La2Mo2O9. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim