Displacive Character of the Paraelectric-Ferroelectric Phase Transition in K_2ZnI_4
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概要
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The crystal structure of K_2ZnI_4 is refined at 24 temperatures above and below the paraelectric-ferroelectric phase transition temperature by means of X-ray diffraction to reinvestigate the mechanism of the phase transition in more detail. The temperature dependence of the translation of K(l) and K(2) along the b-axis and the rotational angle of the ZnI_4 tetrahedron about the axis nearly parallel to the α-axis is obtained by the structural analyses. It is concluded that the mechanism of this phase transition is not the order-disorder type but the displacive one. The temperature variation of the amsotropic temperature parameter U_22 of K(1), K(2), I(1) and I(2) is coincident with the theoretical prediction for the displacive type phase transition proposed by Fujii and Matsubara [Prog Theor Phys 78 (1987) 177].
- 社団法人日本物理学会の論文
- 2003-09-15
著者
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Mashiyama Hiroyuki
Department Of Physics Biology And Informatics Faculty Of Science Yamaguchi University
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Mashiyama Hiroyuki
Department Of Physics Faculty Of Science Yamaguchi University
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Kasano Hironobu
Department Of Physics Faculty Of Science Yamaguchi University
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