A new trivalent cationic conducting solid electrolyte with NASICON-type structure

A new trivalent cation conducting solid electrolyte with the NASICON-type structure, Sc1/3Zr2(PO4)3, was synthesized by a sol–gel method and trivalent cation conducting properties were investigated. The trivalent ion conductivity of Sc1/3Zr2(PO4)3 was comparable to those of the trivalent ion conducting tungstates with the Sc2(WO4)3-type structure and its conductivity at 600°C is 1.06×10−4 S cm−1, which is 2.5 times as high as that of Al2(WO4)3. The Sc3+ cation migration in Sc1/3Zr2(PO4)3 was directly demonstrated by a dc electrolysis.