Journal of Physical Studies 26(3), Article 3601 [10 pages] (2022) DOI: https://doi.org/10.30970/jps.26.3601 INFLUENCE OF ELECTRIC FIELD E3 ON THE PHASE TRANSITION AND THERMODYNAMIC CHARACTERISTICS OF GPI FERROELECTRICS R. R. Levitskii{1} , I. R. Zachek{2} , A. S. Andrushchak{2}  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, Bandera St., Lviv, UA–79013, Ukraine Received 22 February 2022; in final form 19 June 2022; accepted 04 July 2022; published online 10 September 2022

Using the proposed model of the GPI ferroelectrics within the framework of the two-particle cluster approximation, the components of polarization vector and static dielectric permittivity tensor, piezoelectric characteristics, and molar specific heat of the crystal presence of the electric field $E_3$ are calculated. A possibility of appearance of the first order phase transition in the crystal is analyzed; the temperature and field behavior of the calculated thermodynamic characteristics are explored.

Key words: ferroelectrics, phase transition, dielectric permittivity, piezomoduli, electric field.

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