These novel compounds were synthesized by using ion-exchange reactions of the parent Na-based compounds. The crystal structures of the Ag ion-exchanged compounds were determined by means of Rietveld analysis of powder X-ray diffraction patterns. It was found that the Ag ion-exchange compounds retained the structural characteristics of the parent phases. The inter-layer Ag ions in the Ag ion-exchanged compounds had a rocksalt-type coordination. These compounds, which were probably metastable, could be obtained only by ion-exchange. Ionic conductivities which were attributed to inter-layer Ag ions were observed at high temperatures. The ionic conductivity of AgLaTiO4 was much higher than that of NaLaTiO4. Such a high ionic conductivity was suggested to be due to the higher polarizability of the Ag ion.

K.Toda, S.Kurita, M.Sato: Solid State Ionics, 1995, 81[3-4], 267-71