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Samples Lan+1NinO3n+1–δ(n=2,3) have been prepared by two different methods, which lead to different oxygen stoichiometry values. Materials obtained by the citrate route always show higher content of Ni3+ , which can be rationalized by the high reactivity and the original morphology of the precursors obtained by this method.
Carvalho et al. (Wed,) studied this question.