合成した立方晶系リューサイト型化合物の熱膨張特性

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  • Thermal Expansion Property of Synthetic Cubic Leucite-Type Compounds.

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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 1273K using high-temperature X-ray diffraction (HTXRD) and low-temperature X-ray diffraction (LTXRD). The thermal expansion rates of both the synthetic cubic CsB0.2Al0.8Si2O6 and cubic Cs2MSi5O12 (M=Cd, Mg, Ni, Zn) were lower than that of the synthetic cubic CsMSi2O6 (M=Al, Fe), and the thermal expansion rate of the synthetic cubic Cs0.9Al0.9Si2.1O6 was lower than that of CsAlSi2O6. Consequently, decreasing the average ionic radius of cations in the M site, or increasing the Si/M molar ratio of the (Si, M)O4 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.

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