Journal of Physical Studies 24(2), Article 2702 [13 pages] (2020)
DOI: https://doi.org/10.30970/jps.24.2702

FIELD AND DEFORMATION EFFECTS IN RbHSO4 FERROELECTRIC

A. S. Vdovych1, R. R. Levitskii1, I. R. Zachek2

1Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine,
1, Svientsitskii St., UA-79011, Lviv, Ukraine,
2Lviv Polytechnic National University,
12, Bandery St., UA-79013, Lviv, Ukraine

Received 16 April 2020; in final form 14 May 2020; accepted 19 May 2020; published online 15 June 2020

A modified four-sublattice pseudospin model for RbHSO$_{4}$ ferroelectric, which takes into account the piezoelectric coupling of the pseudospin subsystem with lattice strains, is proposed. The model also takes into account lowering of the symmetry of the crystal under the influence of shear stresses $σ_{4}$ and $σ_{6}$.

We have calculated, in the mean-field approximation, the spontaneous polarization and longitudinal dielectric permittivity of mechanically free and clamped crystals, their piezoelectric, elastic and thermal characteristics. The effects of hydrostatic and uniaxial pressure, shear stresses and longitudinal electric field on the phase transition and the physical characteristics of the crystal have been investigated. A satisfactory quantitative description of the corresponding experimental data has been obtained. The electrocaloric effect in the crystal has been studied as well.

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