Abstract
The results of precise measurements of spontaneous birefringence in the temperature range of 285 K 320 K for (CH 3 NH 3 ) 5 Bi 2 Cl 11 (PMACB) are presented. Linear dependences between the spontaneous birefringence and the spontaneous polarization in ferroelectric phase were shown in a wide temperature range. Linear relations of the spontaneous birefringence and the excess entropy for PMACB crystals were proved.
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