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Original Articles

Critical behaviour and the order parameter saturation in uniaxial ferroelectrics with the polar axes in and out of a crystallographic direction

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Pages 768-781 | Received 24 May 2010, Accepted 01 Jun 2010, Published online: 20 Nov 2010
 

Abstract

The equations of state for two uniaxial systems: the first with the polar direction identical with one of the crystallographic axes and the second with the polar direction within a crystallographic plane giving a realistic Curie–Weiss constant ratio and the experimentally obtained non-classical critical exponents are used to describe the behaviours of spontaneous polarization and of the susceptibility. The theories are exemplified by the behaviour of molecular-ionic crystals (CH3NH3)5Bi2Cl11 (MAPCB), (CH3NH3)5Bi2Br11 (MAPBB) and (C3N2H5)5Bi2Br11 (IBB).

Acknowledgement

This study was supported by the Polish State Committee for Scientific Research: project register number: N N204 147837.

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