Trivalent Rare Earth Ion Conduction in the Rare Earth Tungstates with the Sc2(WO4)3-Type Structure
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- 作者：Nobuhito Imanaka ; Yasuyuki Kobayashi ; Kazuyasu Fujiwara ; Takuya Asano ; Yusuke Okazaki ; and Gin-ya Adachi
- 刊名：Chemistry of Materials
- 出版年：1998
- 出版时间：July 1998
- 年：1998
- 卷：10
- 期：7
- 页码：2006 - 2012
- 全文大小：141K
- 年卷期：v.10,no.7(July 1998)
- ISSN：1520-5002
文摘
To realize a trivalent ion conduction in solids, the Sc2(WO4)3-type structure was chosenon the basis of the mobile trivalent ions and the structure which reduces the electrostaticinteraction between the framework and the mobile trivalent ionic species as much as possible.The typical conductivity of the rare earth tungstates R2(WO4)3 (R = Sc, Y, and Er-Lu) withthe Sc2(WO4)3-type structure was found to be on the order of 10-5 S cm-1 at 600 
C. Amongthe rare earth tungstates, Sc2(WO4)3 (
600C = 6.5 × 10-5 S cm-1, Ea = 44.1 kJ mol-1) wasfound to be the most suitable size for the ionic conduction with regard to the relation betweenthe mobile ion radius and the lattice size. The rare earth ion conducting characteristicswere investigated by means of the rare earth concentration cell measurements and dcelectrolyses. The electromotive force measurements with the Sc-Y binary alloy and theyttrium tungsten bronze as the electrodes strongly suggest the possibility of the trivalention conduction of rare earths such as Sc3+ and Y3+. Furthermore, by the dc electrolysis, themobile species was clarified to be the rare earth ions Sc3+ and Y3+ in the rare earth tungstateswith the Sc2(WO4)3-type structure.
C. Amongthe rare earth tungstates, Sc2(WO4)3 (600C = 6.5 × 10-5 S cm-1, Ea = 44.1 kJ mol-1) wasfound to be the most suitable size for the ionic conduction with regard to the relation betweenthe mobile ion radius and the lattice size. The rare earth ion conducting characteristicswere investigated by means of the rare earth concentration cell measurements and dcelectrolyses. The electromotive force measurements with the Sc-Y binary alloy and theyttrium tungsten bronze as the electrodes strongly suggest the possibility of the trivalention conduction of rare earths such as Sc3+ and Y3+. Furthermore, by the dc electrolysis, themobile species was clarified to be the rare earth ions Sc3+ and Y3+ in the rare earth tungstateswith the Sc2(WO4)3-type structure.