Abstract
The electrical properties of the Na3Sc(MoO4)3 and Cs2Zr(MoO4)3 compounds are investigated using impedance spectroscopy (1–106 Hz) in the temperature range 100–650°C. Double molybdates in the form of a fine-crystalline powder are obtained by solid-phase synthesis in air at 450–600°C for 20–50 h. It is found that the temperature dependence of the ionic conductivity of ceramic samples exhibits anomalies at temperatures of 605 ± 5°C for Na3Sc(MoO4)3 and 425 ± 15°C for Cs2Zr(MoO4)3 due to the phase transitions, which are confirmed by the data of thermal analysis. Above the superionic transitions, the ionic conductivity reaches 0.084 S/cm (650°C) for Na3Sc(MoO4)3 and 0.002 S/cm (462°C) for Cs2Zr(MoO4)3.
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Original Russian Text © N.I. Sorokin, 2009, published in Fizika Tverdogo Tela, 2009, Vol. 51, No. 6, pp. 1069–1071.