Trivalent Ion Conduction in Molybdates Having Sc 2 (WO 4 ) 3 -Type Structure
2000; American Chemical Society; Volume: 12; Issue: 7 Linguagem: Inglês
10.1021/cm990591w
ISSN1520-5002
AutoresNobuhito Imanaka, Tomohiro Ueda, Yusuke Okazaki, Shinji TAMURA, Gin‐ya Adachi,
Tópico(s)Advanced Battery Materials and Technologies
ResumoA molybdate series with Sc2(WO4)3-type structure, which has been demonstrated to be suitable for trivalent ion conduction, was prepared, and the trivalent ion conducting characteristics of this series were compared with those of the tungstate series. The ionic conductivities of the molybdate series become considerably higher in comparison to those of the tungstate series. Since the ionic radius of Mo6+ is smaller than that of W6+, the oxide anions that form a tetrahedron unit with Mo6+ ion form stronger bonds than those that form a tetrahedron unit with W6+. Stronger hexavalent cation and oxide anion bonding develops more suitable surroundings for trivalent ion migration in the Sc2(WO4)3-type structure. The trivalent ion conducting properties in the molybdate solids were directly characterized by dc electrolysis and EPMA measurements.
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