An analysis of crystal structure of Ca-deficient oxonitridoaluminosilicate, Ca_<0.88>Al_<0.91>Si_<1.09>N_<2.85>O_<0.15>

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A polycrystalline, Ca_<0.88>Al_<0.91>Si_<1.09>N_<2.85>O_<0.15>, was synthesized by a solid state reaction in the ternary system Ca_3N_2, AIN, and Si_3N_4, which was accompanied by a two-step heat treatment, 1600℃ for 2h and then 1800℃ for 2h under the nitrogen pressure of 0.92MPa. The space group of the polycrystalline was confirmed as orthorhombic Cmc2_1 (36) by means of a convergentbeam 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, R_<wp>=0.092. Ca_<0.88>Al_<0.91>Si_<1.09>N_<2.85>O_<0.15> was formed due to the creation of cation vacancies at Ca^<2+> site in CaAlSiN_3, which has the isomorphic structure with LiSi_2N_3 and NaSi_2N_3, by partial replacement of N^<3-> by O^<2->.
社団法人日本セラミックス協会の論文
2009-01-01