Trivalent Ion Conduction of the Sc2(WO4)3–Gd2(WO4)3 System
1998; Elsevier BV; Volume: 111; Issue: 1-2 Linguagem: Inglês
10.1016/s0167-2738(98)00171-4
ISSN1872-7689
AutoresYasuyuki Kobayashi, Takashi Egawa, Yusuke Okazaki, Shinji Tamura, Nobuhito Imanaka, Gin‐ya Adachi,
Tópico(s)Advanced Battery Materials and Technologies
ResumoThe trivalent ionic conduction in the Sc2(WO4)3–Gd2(WO4)3 solid solution with the Sc2(WO4)3-type structure was investigated. The solubility limit of Gd3+ in Sc2(WO4)3 is 60 mol% in the Sc site and the lattice size of the solid solution isotropically expands with increasing the Gd3+ content. The ionic conductivity of the system greatly increased with an increase of the Gd3+ substitution and the maximum value of 6.2×10−5 S cm−1 at 600°C was obtained for the composition, Sc1.6Gd0.4(WO4)3, which is three times higher than that of pure Sc2(WO4)3. The electrolysis result explicitly indicates that the predominant mobile species in the solid solution with the Sc2(WO4)3-structure is trivalent Sc3+ion and that Gd3+ ion in the electrolyte acts as a lattice forming ion to obtain a suitable lattice size for the Sc3+ ion migration.
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