Relationship between anion and cation nonstoichiometries and valence state of titanium in perovskite-type oxynitrides LaTiO2N

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  • MASUDA Yukihiro
    Department of Chemical Science and Technology, Graduate School of Advanced Technology and Science, The University of Tokushima
  • MASHIMA Ryota
    Department of Chemical Science and Technology, Graduate School of Advanced Technology and Science, The University of Tokushima
  • YAMADA Mayu
    Department of Chemical Science and Technology, Graduate School of Advanced Technology and Science, The University of Tokushima
  • IKEUCHI Kaoru
    Department of Chemical Science and Technology, Graduate School of Advanced Technology and Science, The University of Tokushima
  • MURAI Kei-ichiro
    Department of Chemical Science and Technology, Graduate School of Advanced Technology and Science, The University of Tokushima Department of Advanced Materials, Institute of Technology and Science, The University of Tokushima
  • WATERHOUSE Geoffrey I. N.
    Department of Chemistry, The University of Auckland
  • METSON James B.
    Department of Chemistry, The University of Auckland
  • MORIGA Toshihiro
    Department of Chemical Science and Technology, Graduate School of Advanced Technology and Science, The University of Tokushima Department of Advanced Materials, Institute of Technology and Science, The University of Tokushima

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  • Relationship between anion and cation nonstoichiometries and valance state of titanium in perovskite-type oxynitrides LaTiO2N

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Abstract

Three series of (La,Sr)TiO2N compounds, with either anion nonstoichiometry LaTiO2+xN1-x, cation nonstoichiometry La1-x Ti1+xO2N or an La1-xSrxTiO2N series, have been prepared in order to clarify, by XPS spectroscopy, the influence of composition on the valence state of titanium. Though the substitution of lanthanum by strontium was effective in the enhancement of reflectivity in the longer wavelength region above the absorption edge, the valence state of titanium did not change in either the La1-xTi1+xO2N or the La1-xSrxTiO2N series. However, it was found that the increase of oxygen content in the LaTiO2+xN1-x series causes oxidation of the titanium.

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