Journal of Physical Studies 17(4), Article 4703 [12 pages] (2013) DOI: https://doi.org/10.30970/jps.17.4703 THE EFFECT OF PIEZOELECTRIC COUPLING ON THE DEFORMATION EFFECTS IN K(H1-xDx)2PO4 FERROELECTRICS R. R. Levitsky1, I. R. Zachek2, A. S. Vdovych1, I. V. Stasyuk1 {1}Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine 1, Svientsitskii St., Lviv, UA--79011, Ukraine 2Lviv Polytechnic National University, 12, Bandery St., Lviv, UA--79013, Ukraine

Within the modified proton ordering model for the KH$_2$PO$_4$ type ferroelectrics with hydrogen bonds with taking into account the piezoelectric coupling linear on strains $ε_i$ and $ε_6$ contributions into the energy of proton (deuteron) system but without taking into account the tunneling within the four-particle cluster approximation, the effect of hydrostatic and uniaxial pressure on phase transition and physical characteristics of the K(H$_{1-x}$D$_x)_2$PO$_4$ ferroelectrics are studied. At the proper set of the parameters a good quantitative description of the corresponding experimental data is obtained.

PACS number(s): 77.84.-s, 77.22.-d, 77.80.-e, 77.80.Bh, 77.65.Bn

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