Abstract
A new layered perovskite compound, Ag 2La 2Ti 3O 10, was synthesized by an ion-exchange reaction of M 2La 2Ti 3O 10 (M = Na,K) with a AgNO 3 molten salt. The crystal structure and the ionic conductivity of the ion-exchanged compound were investigated. The ionic conductivities attributed to the interlayer silver ions were observed at high temperatures. The ionic conductivity of Ag 2La 2Ti 3O 10 was much higher than that of Na 2La 2Ti 3O 10, while the interlayer sodium ions in Na 2La 2Ti 3O 10 and silver ions in Ag 2La 2Ti 3O 10 have almost the same rock-salt type coordination. The higher conductivity of Ag 2La 2Ti 3O 10 is probably due to the higher polarizability of silver ions.
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