Specific features of phase transitions and the conduction of La2Mo2O9 oxide-ion conducting compound doped with vanadiumстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The X-ray powder analysis, calorimetric studies, and conductivity measurements of a series of ceramic La2Mo2-xVxOy specimens with different vanadium content are performed with the aim of following the dynamics of phase formation of the low-temperature a, high-temperature b, and metastable b(ms) phases. At x >= 0.06, the cubic phase becomes stable and the monoclinic phase vanishes; therefore, the main a -> b transition is suppressed. According to the data of differential thermal analyses, a weak thermal anomaly is observed in the range 450-470 C at x >= 0.06. This anomaly is indicative of the b(ms) -> b transition due to the conversion of the cubic phase with statically disordered oxygen atoms into the cubic phase with dynamic disorder. The conductivity of the high-temperature b phase obeys the Vogel-Tammann-Fulcher law.