The Model of Ferroelectricity in Thiourea
I. Śliwa and W. Wanarski
Physics of Liquid Crystals Laboratory, Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, PL-60-179 Poznań, Poland
Received: December 21, 2010; In final form: March 24, 2011
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In this paper we propose a mechanism of the phenomenon of ferroelectricity in the molecular crystal of thiourea (SC(NH2)2). The mechanism is based on the model of interaction between two molecular electric dipoles. The dipoles are not idealized to points - they have a finite length. Besides, they can reorient mutually and the reorientation is determined by the crystal structure specified by the experimental structural research. On the basis of this theory, a formula for the potential energy of interaction of a pair of two nonpunctual dipoles as a function of the angle of reorientation is derived and discussed.
DOI: 10.12693/APhysPolA.120.516
PACS numbers: 77.80.-e, 77.80.Bh