Influence of uniaxial and hydrostatic pressures and shear stress $\sigma_{5}$ on the phase transition and thermodynamic properties of quasi-one-dimensional ferroelectrics of the CsH$_2$PO$_4$ type

2020;
: pp. 64–78
https://doi.org/10.23939/mmc2020.01.064
Received: November 10, 2019
Revised: January 12, 2020
Accepted: January 13, 2020
1
Institute for Condensed Matter Physics
2
Lviv Polytechnic National University
3
Institute for Condensed Matter Physics
4
Institute for Condensed Matter Physics

Within the framework of the modified proton ordering model for the quasi-one-dimensional hydrogen bonded ferroelectrics of the CsH$_2$PO$_4$ type with taking into account the linear in the strains  $\varepsilon_1$, $\varepsilon_2$, $\varepsilon_3$, and $\varepsilon_5$ contributions into the energy of the proton subsystem, without tunneling, using the two-particle cluster approximation, we study the influence of uniaxial pressures $p_{i}$, hydrostatic pressure $p_{h}$, and shear stress $\sigma_{5}$ on the phase transition, polarization, transverse dielectric permittivity, elastic constants and piezoelectric coefficients of the quasi-one-dimensional CsH$_2$PO$_4$ ferroelectric crystals.

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Mathematical Modeling and Computing, Vol. 7, No. 1, pp. 64–78 (2020)