Journal of Physical Studies 14(3), Article 3701 [11 pages] (2010) DOI: https://doi.org/10.30970/jps.14.3701 THE THERMODYNAMICS OF THE ROCHELLE SALT NaKC4H4O6·4H2O CRYSTAL STUDIED WITHIN THE MITSUI MODEL EXTENDED BY PIEZOELECTRIC INTERACTION AND TRANSVERSE FIELD R. R. Levitskii1, I. R. Zachek2, A. Ya. Andrusyk1 1Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Sventsitsky St., 79011 Lviv, Ukraine 2Lviv Polytechnic National University, 12 Bandera St., 79013 Lviv, Ukraine

We calculated dielectric, piezoelectric and elastic properties of the Rochelle salt within the Mitsui model extended by piezoelectric interaction and transverse field. This field occurs due to dynamic flipping of ordering structure elements between two equilibrium positions. We the studied static characteristics within molecular field approximation. We derived unique parameter set that allows us to achieve a better description of the physical characteristics (particularly for spontaneous polarization) as compared with the analogous model that does not take into account transverse field.

PACS number(s): 77.22.Ch, 77.22.Gm, 77.65.Bn, 77.80.Bh

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