Silver magnesium molybdate and silver cobalt molybdate: Synthesis and ionic conductivity |
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| Authors: | A A Il’ina I A Stenina G V Lysanova A G Veresov A B Yaroslavtsev |
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| Institution: | (1) Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991, Russia;(2) Chemistry Faculty, Moscow State University, Vorob’evy gory, Moscow, 119992, Russia |
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| Abstract: | Impedance spectroscopy, X-ray powder diffraction, and electron microscopy are used to study silver magnesium and silver cobalt molybdates of composition Ag2A 2 II (MoO4)3 (A = Mg, Co) and the products of their aliovalent doping by scandium(III) and vanadium(V). The double molybdates have high ionic conductivities at temperatures above 600 K. A partial aliovalent substitution of scandium for magnesium or vanadium for molybdenum increases the ionic conductivity of the molybdates below 473 K. The defect mobility and the enthalpy of defect formation in the Ag2Mg2(MoO4)3 structure are estimated proceeding from the experimental data. |
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