Trivalent Cation Conduction in the Sc2(WO4)3-Type Structure

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  • ADACHI Gin-ya
    Department of Applied Chemistry, Faculty of Engineering, Osaka University
  • KÖHLER Joachim
    Department of Applied Chemistry, Faculty of Engineering, Osaka University
  • IMANAKA Nobuhito
    Department of Applied Chemistry, Faculty of Engineering, Osaka University

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タイトル別名
  • Trivalent Cation Conduction in the Sc<sub>2</sub>(WO<sub>4</sub>)<sub>3</sub>-Type Structure

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<p>The electrical conductivity of the M2(WO4)3 (M = Rare Earth, In, Al) solid electrolyte series amounts to 3.2×10−6-6.5×10−5Ω−1cm−1 with corresponding activation energies of 44.1-91.0 kJ/mol. These electrical properties can be individually improved, as is exemplary shown for the case of Sc2(WO4)3 and A12(WO4)3, by the formation of mixed cationic tungstates of the type (Sc1−xMx)2(WO4)3 (M = In, Lu, Dy, Gd) and (Al1−xScx)2(WO4)3 solid solutions, respectively. The larger cations (rM3+>rsc3+ and rsc3+>rAl3+) act to expand the host lattice for an easier migration of the Sc3+ and Al3+ cations, respectively. Maximum enhanced conductivities of about 5 times (Sc3+ conductors) and 6 times (Al3+ conductors) have been observed. The trivalent cations (M) were quantitatively and qualitatively identified as mobile charge carrying species with a cationic transference number of t+ > 0.99. Scandium cations have been identified in (Scl−xMx(WO4)3 (M = In, Dy, Gd) as main charge carrying species, whereas in (Scl−xLux)2(WO4)3 and (Al1−xScx)2(WO4)3 the predominant charge carrier changes in dependence on the composition. The experimental procedure for the characterization of M2(WO4)3 and (Sc1−xMx)2(WO4)3 as trivalent cationic conducting solid electrolytes is also given.</p>

収録刊行物

  • Electrochemistry

    Electrochemistry 67 (7), 744-751, 1999-07-05

    公益社団法人　電気化学会

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