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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.117  No.1361 (January) (2009)  >  pp.94-98

Journal of the Ceramic Society of Japan
<<Previous article Vol.117  No.1361 (January) (2009)   pp.94 - 98 Next article>>

An analysis of crystal structure of Ca-deficient oxonitridoaluminosilicate, Ca0.88Al0.91Si1.09N2.85O0.15

Kyota UHEDA1), Hajime YAMAMOTO1), Hisanori YAMANE2), Wataru INAMI3), Kenji TSUDA3), Yoshinobu YAMAMOTO4) and Naoto HIROSAKI4)
1) School of Bionics, Tokyo University of Technology
2) Tohoku University Institute of Multidisciplinary Research for Advanced Materials Center for Advanced Nitride Technology
3) Tohoku University Institute of Multidisciplinary Research for Advanced Materials Center for Advanced Microscopy and Spectroscopy
4) Nano Ceramics Center, National Institute for Materials Science


  A polycrystalline, Ca0.88Al0.91Si1.09N2.85O0.15, was synthesized by a solid state reaction in the ternary system Ca3N2, AlN, and Si3N4, which was accompanied by a two-step heat treatment, 1600°C for 2 h and then 1800°C for 2 h under the nitrogen pressure of 0.92MPa. The space group of the polycrystalline was confirmed as orthorhombic Cmc21 (36) by means of a convergent-beam electron diffraction (CBED). The lattice parameters were refined using the Rietveld method to be a = 980.005(8), b = 564.928(4), and c = 506.241(3) pm with the corresponding weighted profile residual, Rwp = 0.092. Ca0.88Al0.91Si1.09N2.85O0.15 was formed due to the creation of cation vacancies at Ca2+ site in CaAlSiN3, which has the isomorphic structure with LiSi2N3 and NaSi2N3, by partial replacement of N3- by O2-.


Keyword:
Nitride, Oxynitride, Nitridoaluminosilicate, Crystal structure, Crystal system, Convergent-beam electron diffraction (CBED), Red phosphor, LED

Received: September 08, 2008
Accepted: November 20, 2008 , Published online: January 01, 2009
Copyright (c) 2009 The Ceramic Society of Japan

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