The ionic conduction of trivalent Al in this tungstate was quantitatively demonstrated. The ion-conducting characteristics were investigated by means of electrolysis and electromotive force measurements in an Al concentration cell; using 3 types of alloy (Al55Pt45, Al42Pt58, Al35Pt65) as the electrodes. The direct-current electrolysis data strongly supported the conclusion that Al3+ was the mobile species. Using electromotive force measurements, the mobile species was quantitatively identified as being Al3+. The conducting properties of Al2(WO4)3-In2(WO4)3 solid solutions were also investigated. It was found that the Al3+ ion conduction increased, with increasing In content, up to 80mol%. The latter solid solution exhibited a 5 times higher conductivity than that of pure Al2(WO4)3.

Quantitative Demonstration of Al3+ Ion Conduction in Al2(WO4)3 Solids. Y.Kobayashi, S.Tamura, N.Imanaka, G.Adachi: Solid State Ionics, 1998, 113-115, 545-52