Thermal Expansion Property of Synthetic Cubic Leucite-Type Compounds

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/110002290021/Various cubic Cs-leucite compounds with the space group Ia3d were synthesized by a solid-state reaction method, and thermal expansion properties for the synthetic powders were studied in the temperature range from 123 to 1273 K using high-temperature X-ray diffraction (HTXRD) and low-temperature X-ray diffraction (LTXRD). The thermal expansion rates of both the synthetic cubic CsB-<0.2>Al_<0.8>Si_2O_6 and cubic Cs_2MSi_5O_<12> (M=Cd, Mg, Ni, Zn) were lower than that of the synthetic cubic CsMSi_2O_6 (M=Al, Fe), and the thermal expansion rate of the synthetic cubic Cs_<0.9>Al_<0.9>Si_<2.1>O_6 was lower than that of CsAlSi_2O_6. Consequently, decreasing the average ionic radius of cations in the M site, or increasing the Si/M molar ratio of the (Si, M)O_4 tetrahedra was found to be effective for decreasing the thermal expansion rate. Furthermore, it was suggested that the increase of the space for Cs sites in the unit cell decreases the thermal expansion rate of the cubic Cs-leucite compounds with the space group Ia3d