Solid solutions of the form, La0.67-xLi3xTiO3 (where x ranged from 0.15 to 0.04), were prepared via the substitution mechanism: La  3Li. Superstructure reflections in this range were consistent with a superlattice that consisted of the stacking of 2 perovskite sub-cells. A line-splitting phenomenon which was observed for x-values of less than about 0.1 indicated that tetragonal distortion of the cubic perovskite sub-cell occurred. It was found that the solid solutions exhibited Li conductivities which were greater than 0.0001S/cm at room temperature for a wide range of x-values above 0.04. A maximum conductivity of 0.0011S/cm was found for x = 0.1. A dome-shaped compositional dependence of the conductivity indicated that the conduction mechanism involved the movement of Li ions through A-site vacancies.

H.Kawai, J.Kuwano: Journal of the Electrochemical Society, 1994, 141[7], L78-9