立方晶系Cs_2MSi_5O_<12>(M=Cd,Ni,Zn)の粉末合成と熱膨張特性

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rights: 社団法人日本セラミックス協会rights: 本文データは学協会の許諾に基づきCiNiiから複製したものであるrelation: isVersionOf: http://ci.nii.ac.jp/naid/110002289534/Monolithic Cs_2Msi_5O_<12>(M = Cd, Ni. Zn) with cubic symmetry, space group Ia3^^-d, was synthesized in air according to a two stage heat treatment. Mixed raw material powders were calcined at 973 to 1023 K for 20 to 40h until the Cs_2Msi_5O_<12>(M=Cd, Ni, Zn) phase were recognized by XRD and then they were heated at 1273 to 1473 K for 20h. The thermal expansion of the synthesized Cs_2Msi_5O_<12>(M=Cd, Ni. Zn) powders was investigated using high-temperature X-ray diffraction at 298 to 1273 K. The Cs_2Msi_5O_<12>(M=Cd, Ni, Zn) powders having SiO_4/MO_4^<2-> = 5, displayed a lower thermal expansion than those of CsMSi_2O_6(M=Al, Fe) having SiO_4/MO_4- = 2 in the low temperature range. With increasing the ionic radius of M^<2+>, the thermal expansion coefficient of the synthesized Cs_2Msi_5O_<12> (M=Cd, Ni, Zn) was increased in the low temperature range.
社団法人日本セラミックス協会の論文
1998-11-01