CaO-Y2O3-SiO2 oxides prepared at 1700 K in air

Toru Nagasawa, Hisanori Yamane, Shun Ichi Kubota, Masahiko Shimada

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13 Citations (Scopus)


Samples having various compositions were prepared in air by solid phase reaction at 1700 K in order to investigate the presence of compounds in the CaO-SiO2-Y2O3 system. The quaternary oxides obtained were Ca2Y8Si6O26 (hexagonal, P63/m, α=0.93429(2), c=0.67893(1)nm, apatite-type structure), Ca2Y2Si2O9 (monoclinic, P21/c, α=0.74470(3), b=1.04926(3), c=1.09666(5)nm, β=110.179(3)°, cuspidine-type structure), Ca3Y2Si3O12 (orthorhombic, Pnma, α=0.65420(3), b=1.56280(6), c=1.00331(4)nm, silico-carnotite-type structure) and Ca3Y2Si6O18 (monoclinic, C2/c, α=1.33422(5), b=0.77320(3), c=1.47959(6)nm, β=90.263(3)°). Reversible phase transformation of Ca2Y2Si2O9 was suggested from the examination of samples annealed at 1900 K (orthorhombic) and at 1700 K (monoclinic). The crystal structure of Ca2Y8Si6O26 was refined by Rietveld analysis for the X-ray powder diffraction pattern.

Original languageEnglish
Pages (from-to)1238-1241
Number of pages4
JournalJournal of the Ceramic Society of Japan
Issue number12
Publication statusPublished - 1998 Dec


  • Calcium yttrium silicates
  • Crystal structure
  • Solid phase reaction

ASJC Scopus subject areas

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

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