LITHIUM ION CONDUCTIVITY IN THE PEROVSKITE-TYPE LITAO3-SRTIO3 SOLID-SOLUTION

The lithium ion conductivity in the perovskite-type xLiTaO(3)-(1-x)SrT iO3 solid solution (0.30 less than or equal to x less than or equal to 0.50) has been investigated. The highest ionic conductivity of 5.5X10 (-4) S cm(-1) at 300 K appears at x=0.50. The ion conductivity decreas es with a decrease in x and then rapidly decreases in the vicinity of x=0.30. This threshold for the ion conductivity is the same as the sit e percolation threshold for a simple cubic lattice. This indicates tha t the lithium ion conduction occurs three-dimensionally among the A-si tes of the perovskite.