An analysis of crystal structure of Ca-deficient oxonitridoaluminosilicate, Ca0.88Al0.91Si1.09N2.85 0.15

Kyota Uheda, Hajime Yamamoto, Hisanori Yamane, Wataru Inami, Kenji Tsuda, Yoshinobu Yamamoto, Naoto Hirosaki

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13 Citations (Scopus)

Abstract

A polycrystalline, Ca0.88Al0.91Si 1.09N2.85O0.15, 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. Ca0.88Al 0.91Si1.09N2.85O0.15 was formed due to the creation of cation vacancies at Ca2+ site in CaAlSiN 3 which has the isomorphic structure with LiSi2N 3 and NaSi2N3, by partial replacement of N 3- by O2-.

Original languageEnglish
Pages (from-to)94-98
Number of pages5
JournalJournal of the Ceramic Society of Japan
Volume117
Issue number1361
DOIs
Publication statusPublished - 2009 Jan

Keywords

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

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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