Lithium Ion Conductivity of A‐Site Deficient Perovskite Solid Solution La0.67 − x Li3x TiO3

solid solution forms in the range by the substitution mechanism . Superstructure reflections observed in this range are consistent with a superlattice consisting of the stacking of two perovskite subcells. A line‐splitting phenomenon observed for indicates that the tetragonal distortion of the cubic perovskite subcell occurs. The solid solutions exhibit high lithium ion conductivities greater than 10 −4 S cm −1 at room temperature in a wide range, . A maximum conductivity of is found at . The dome‐shaped composition dependence of conductivity indicates that the conduction mechanism involves the movement of lithium ions through the A‐site vacancies.