Crystal Structure Determination of SbSI
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概要
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A change of atomic arrangement of SbSI between the paraelectric phase and the ferroelectric phase is investigated. Analyses are made on Weissenberg photographs taken at 35℃ (paraelectric phase) and at 5℃ (ferroelectric phase). In the paraelectric phase (space group D^<15>_<2h>-Pnam, lattice constants, a = 8.52Å b = 10.13Å c = 4.10Å), the atomic positions are: Sb(x = 0.118_9, y = 0.124_3, z = 1/4), S(x = 0.84_0, y = 0.05_0, z = 1/4), I(x = 0.508_0, y = 0.827_6, z = 1/4); the thermal vibration of Sb ions along the c axis is relatively large with the mean square amplitude U^^-_2^2 = (0.16)^2Å^2. In the ferroelectric phase (C^9_<2v> -Pna2_1), the x and y parameters are substantially the same as those determined in the paraelectric phase. Major changes take place in the z parameters: Sb(z = 1/4 + 0.04_8) and S(z = 1/4 + 0.01) shift along the ferroelectric c axis with respect to iodine by 0.20Å and 0.05Å respectively. Evidences are shown that the phase transition is of displacive type.
- 社団法人日本物理学会の論文
- 1967-08-05
著者
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Oka Yoshio
Sony Corporation Research Laboratory
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Sawaguchi Etsuro
Sony Corporation Research Laboratory
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Kikuchi Atsushi
Sony Corporation Research Laboratory
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KIKUCHI Atsushi
Sony Corporation, Research Laboratory
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