Abstract
Ni <I>K-edge</I> X-ray absorption spectroscopy was applied to investigate the electronic and defect structures of La2-<I>x</I>Sr<I>x</I>NiO4{plus minus}δ (<I>x</I> = 0 - 1.0) annealed under various oxygen partial pressures. X-ray absorption near edge structure (XANES) indicated that the mean valence of Ni ions increased by increasing Sr contents and oxygen partial pressure, accompanied by variation of oxygen nonstoichiometry, in the composition range having excess oxygens and oxygen vacancies. Ni <I>L-edge</I> XANES spectra of La2-<I>x</I>Sr<I>x</I>NiO4{plus minus}δ were used to decide the valence state and the spin state of Ni ions. By increasing Sr contents and oxygen partial pressure, it was found that Ni(II) ions decreased and the low spin state of Ni(III) ions increased.
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