Precise measurements have been made on X-ray Bragg reflections by SbSI. Temperature dependence of the (00 l ) X-ray Bragg reflections suggests that the ferroelectric phase transition in SbSI is of the displacive type. Difference between the integrated intensity of (082) Bragg reflection measured in the ferroelectric phase and that of the extrapolated paraelectric phase is approximately proportional to the squared spontaneous polarization.
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Takama et al. (1967) studied this question.
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