大気中1700Kで合成されたCaO-Y_2O_3-SiO_2系の酸化物

概要

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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-SiO_2-Y_2O_3 system. The quaternary oxides obtained were Ca_2Y_8Si_6O_6lt;26>(hexagonal, P6_3/m, a=0.93429(2), c=0.67893(1)nm, apatite-type structure), Ca_2Y_2Si_2O_9(monoclinic, P2_1/c, a=0.74470(3), b=1.04926(3), c=1.09666(5)nm, β=110.179(3)°, cuspidine-type structure), Ca_3Y_2Si_3O_<12>(orthorhombic, Pnma, a=0.65420(3), b=1.56280(6), c=1.00331(4)nm, silico-carnotite-type structure)and Ca_3Y_2Si_6O_<18>(monoclinic, C2/c, a=1.33422(5), b=0.77320(3), c=1.47959(6)nm, β=90.263(3)°). Reversible phase transformation of Ca_2Y_2Si_2O_9 was suggested from the examination of samples annealed at 1900 K(orthorhombic)and at 1700 K(monoclinic). The crystal structure of Ca_2Y_8Si_6O_<26> was refined by Rietveld analysis for the X-ray powder diffraction pattern.
社団法人日本セラミックス協会の論文
1998-12-01