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

Yukihiro MASUDA; Ryota MASHIMA; Mayu YAMADA; Kaoru IKEUCHI; Kei-ichiro MURAI; Geoffrey I. N. WATERHOUSE; James B. METSON; Toshihiro MORIGA

doi:10.2109/jcersj2.117.76

Papers

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

Yukihiro MASUDA, Ryota MASHIMA, Mayu YAMADA, Kaoru IKEUCHI, Kei-ichiro MURAI, Geoffrey I. N. WATERHOUSE, James B. METSON, Toshihiro MORIGA

Author information

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

Keywords: Perovskite-type oxynitrides, Nonstoichiometry, Bandgap, Reflectivity, XPS, Surface composition, Valence state of titanium

JOURNAL FREE ACCESS

2009 Volume 117 Issue 1361 Pages 76-81

DOI https://doi.org/10.2109/jcersj2.117.76

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Abstract

Three series of (La,Sr)TiO₂N compounds, with either anion nonstoichiometry LaTiO_2+xN_1-x, cation nonstoichiometry La_1-x Ti_1+xO₂N or an La_1-xSr_xTiO₂N 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 La_1-xTi_1+xO₂N or the La_1-xSr_xTiO₂N series. However, it was found that the increase of oxygen content in the LaTiO_2+xN_1-x series causes oxidation of the titanium.

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