Abstract
Abstract Trivalent rare earth ion conductors of the (R0.05Zr0.95)80⁄79Nb(PO4)3 (R: rare earths) series with NASICON-type structures were successfully prepared and the optimum size of ion-conducting pathways for rare earth ions in (R0.05Zr0.95)80⁄79Nb(PO4)3 solids was investigated. The most suitable ion-conducting pathway for rare earth ion conduction in this series was realized for R=Dy and the highest conductivity of 3.2×10−4 S cm−1 at 600 °C was obtained for (Dy0.05Zr0.95)80⁄79Nb(PO4)3 solids. Since R3+ ion conduction was strongly dependent on the ratio of conducting R3+ ion size to crystal lattice size (VR3+⁄Vlattice; we denote this ratio as A ratio in this article), it was clear that the A ratio is a key factor to optimize R3+ ion conduction in NASICON-type structures.
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