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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.117  No.1361 (January) (2009)  >  pp.76-81

Journal of the Ceramic Society of Japan
<<Previous article Vol.117  No.1361 (January) (2009)   pp.76 - 81 Next article>>

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

Yukihiro MASUDA1), Ryota MASHIMA1), Mayu YAMADA1), Kaoru IKEUCHI1), Kei-ichiro MURAI1)2), Geoffrey I. N. WATERHOUSE3), James B. METSON3) and Toshihiro MORIGA1)2)
1) Department of Chemical Science and Technology, Graduate School of Advanced Technology and Science, The University of Tokushima
2) Department of Advanced Materials, Institute of Technology and Science, The University of Tokushima
3) Department of Chemistry, The University of Auckland

  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.

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

Received: August 29, 2008
Accepted: November 20, 2008 , Published online: January 01, 2009
Copyright (c) 2009 The Ceramic Society of Japan



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