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Thin films of the LixLa2/3+yTiO3- perovskite (with 0.5) were deposited by the laser ablation technique from Li0.33La0.56TiO3 targets. Their growth onto MgO substrateswas studied as afunction of the oxygen pressure. For films grown in vacuum (10-6mbar), aLa0.63TiO2.5 composition was obtained, meaning that Ti3+ alone is present in the films, while Li ions are not incorporated under these conditions...