粉末法高温・低温X線回折による合成ポルーサイトの熱膨張特性評価<ミニノート>

概要

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The thermal expansion properties of the synthesized CsAlSi2O6 and Cs0.9Al0.9Si2.1O6, prepared by the solid-state reaction of CsNO3 powder and Al2O3 and SiO2 powders, were investigated by powder high- and low-temperature X-ray diffractions in the temperature range of 123 to 1273 K. The thermal expansion rate of Cs0.9Al0.9Si2.1O6 was smaller than that of CsAlSi2O6 in the temperature range of 298 to 1273 K of which the crystal systems were cubic with space group Ia-3d. On the other hand, CsAlSi2O6 and Cs0.9Al0.9Si2.1O6 underwent a structural phase transformation of tetragonal to cubic in the temperature range of 223 to 273 and of 123 to 173 K, respectively. A large thermal expansion in the range of 298 to 373 K observed in the property of CsAlSi2O6 was similarly observed in the range of 173 to 273 K in the property of Cs0.9Al0.9Si2.1O6. The results suggested that lowering of the structural phase transformation temperature was due to decreasing the thermal expansion rate of Cs0.9Al0.9Si2.1O6 above room temperature.
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