Influence of Cation Vacancies on Li Conductivity of La 1/2 Li 1/2-2 x Sr x TiO 3 Perovskites (0 < x ≤ 0.25): The Role of Nominal and Effective Vacancies.

The Li 1/2-2 x Sr x La 1/2 TiO 3 series (0 ≤ x ≤ 0.25) is investigated with X-ray diffraction, nuclear magnetic resonance, and impedance spectroscopy techniques. The substitution of two Li + by one Sr 2+ in Li 1/2 La 1/2 TiO 3 perovskite generates cation vacancies that, when ordered in alternating planes along the c -axis, confer a two-dimensional character to Li mobility. In previous works, it was shown that Li + ions partially occupy the center of the six faces of the cubic perovskite, resulting in the associated A-sites to participate like a vacancy in the definition of the percolation vacancy threshold. The results obtained in the Li 1/2-2 x Sr x La 1/2 TiO 3 series are compared with those obtained in the Li 3 x La 2/3- x TiO 3 series, and other Sr-doped solid solutions (Li 1/2- x Sr 2 x La 1/2- x TiO 3 and Li x Sr x La 2/3- x TiO 3 ), to highlight the importance of the effective vacancies with respect to the nominal ones in conductivity. The analysis of four series, belonging to the ternary SrTiO 3 -La 2/3 TiO 3 -Li 2 TiO 3 phase diagram, permits a better understanding of the ionic conduction mechanism in perovskites. The results show that the vacancy percolation model is more adequate to explain Li conductivity than the conventional hopping probability model. In the analyzed series, Li conductivity is maximum when a small amount of Sr is incorporated into the pseudo-cubic La 1/2 Li 1/2 TiO 3 end member, while it decreases as the amount of strontium increases.