X-Ray Study of LiCsSO_4 in Connection with Its Ferroelastic Phase Transition

概要

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The crystal structure of LiCsSO. was studied at 25, 0, -20 and -40'C in the normat phase and - 71, - 78 and - l00'Cin the ferroelastic phase by using X-ray reflec-lion data collected by an automatic four circle diffractometer. The librational motionof SO. is highly anisotropic in the high temperature phase. Temperature variation ofthe atomic position of S or 0 atoms was small in the low temperature phase. Themutual proportionality between the temperature dependence of observed structurefactors of reflections 201, 203, 205, 311 and 131 and that of the deviation angle Ay ofthe monoclinic angle y from 90' was found, which suggests that the phase transitionis characterized by the order-disorder nature of the SO. ion coupled with the shearstrain x..dielectrics, phase transition, crystal structure, ferroelasticity, experiment
社団法人日本物理学会の論文
1988-12-15