Journal of Physical Studies 25(3), Article 3702 [14 pages] (2021) DOI: https://doi.org/10.30970/jps.25.3702 INFLUENCE OF UNIAXIAL AND HYDROSTATIC PRESSURES AND A LONGITUDINAL ELECTRIC FIELD ON THE THERMODYNAMIC CHARACTERISTICS OF THE QUASI-ONE-DIMENSIONAL FERROELECTRIC CsH2PO4 A. S. Vdovych1 , R. R. Levitskii1, I. R. Zachek2, A. P. Moina1  1Institute 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 Received 04 January 2021; in final form 22 April 2021; accepted 11 May 2021; published online 14 July 2021

We propose a two-sublattice proton ordering model for the quasi-one-dimensional CsH$_2$PO$_4$ ferroelectric with hydrogen bonds, which takes into account contributions to the energy of the proton subsystem that are linear in the lattice strains $ε_1$, $ε_2$, $ε_3$, and $ε_5$. The model also takes into account the dependence of the effective dipole moments of pseudospins on the order parameters, which enables us to coordinate the values of the effective dipole moments in the paraelectric and ferroelectric phases. Within this model in the two-particle cluster approximation for the short-range interactions and in the mean field approximation for the long-range interactions, the behavior of spontaneous polarization, longitudinal dielectric permittivity, piezoelectric and elastic characteristics, and molar heat capacity under the influence of uniaxial and hydrostatic pressure and a longitudinal electric field are investigated.

Key words: ferroelectrics, dielectric permittivity, piezoelectric coefficients, pressure effect, electric field effect

Full text

1. H. Matsunaga, K. Itoh, E. Nakamura, J. Phys. Soc. Jpn. 48, 2011 (1980);
   Crossref
2. K. Itoh, T. Hagiwara, E. Nakamura, J. Phys. Soc. Jpn. 52, 2626 (1983);
   Crossref
3. Y. Iwata, N. Koyano, I. Shibuya, J. Phys. Soc. Jpn. 49, 304 (1980);
   Crossref
4. Y. Iwata et al, J. Phys. Soc. Jpn. 63, 4044 (1994);
   Crossref
5. N. Yasuda et al, Phys. Rev. Lett. 41, 1311 (1978);
   Crossref
6. N. Yasuda, S. Fujimoto, M. Okamoto, H. Shimizu, K. Yoshino, Y. Phys. Rev. B 20, 2755 (1979);
   Crossref
7. P. J. Schuele, R. A. Thomas. Jap. J. Appl. Phys. 24, 935 (1985);
   Crossref
8. P. J. Schuele, V. H. Schmidt, Phys. Rev. B 39, 2549, (1989);
   Crossref
9. Yu. Kobayashi et al, Ferroelectrics 285, 83 (2003);
   Crossref
10. K. Gesi, K. Ozawa. Jpn. J. Appl. Phys. 17, 435 (1978);
    Crossref
11. N. B. Brandt, S. G. Zhukov, V. A. Kulbachinskii, P. S. Smirnov, B. A. Strukov, Fiz. Tverd. Tela 28, 3159 (1986).
12. E. Magome, S. Tomiaka, Y. Tao, M. Komukae. J. Phys. Soc. Jpn. 79, 025002 (2010);
    Crossref
13. Ya. Shchur, Phys. Rev. B 74, 054301 (2006);
    Crossref
14. Ya. Shchur, Phys. Status Solidi B 244, 569 (2007);
    Crossref
15. J. Lasave, P. Abufager, S. Koval, Phys. Rev. B 93, 134112 (2016);
    Crossref
16. Ya. Shchur, T. Bryk, I. Klevets, A.V. Kityk, Comput. Mater. Sci. 111. 301 (2016);
    Crossref
17. B. Van Troeye et al, Phys. Rev. B 95, 024112 (2017);
    Crossref
18. R. Blinc, F. C. SaBaretto, J. Chem. Phys. 72, 6031 (1988);
    Crossref
19. I. V. Stasyuk et al., preprint ICMP-91-4R (Lviv, 1991).
20. K. Deguchi, E. Okaue, S. Ushio, E. Nakamura, K. Abe, J. Phys. Soc. Jpn. 53, 3074 (1984);
    Crossref
21. R. R. Levitskii, I. R. Zachek, A. S. Vdovych, Phys. Chem. Solid State 13, 40 (2012).
22. R. R. Levitskii, I. R. Zachek, A. S. Vdovych, J. Phys. Stud. 16, 4702 (2012);
    Crossref
23. A. S. Vdovych, I. R. Zachek, R. R. Levitskii, Condens. Matter Phys. 23, 33702 (2020);
    Crossref
24. K. Imai, J. Phys. Soc. Jpn. 52, 3960 (1983);
    Crossref
25. S. Praver, T. F. Smith, T. R. Finlayson, Aust. J. Phys. 38 63 (1985);
    Crossref
26. Y. Uesu, J. Kobayashi, Phys. Status Solidi A 34, 475 (1976);
    Crossref
27. R. J. Nelmess, R. N. P. Choudhary, Solid State Commun. 26, 823 (1978);
    Crossref
28. B. C. Fraser, D. Semmingsen, W. D. Ellenson, D. Shirane. Phys. Rev. B 20, 2745 (1979);
    Crossref