DOI: https://doi.org/10.30970/jps.04.92
MICROSCOPIC MODEL OF PHASE TRANSITION IN THE CRYSTALS OF THE DMAAlS AND DMAGaS TYPES
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Journal of Physical Studies 4(1), 92–99 (2000)
DOI: https://doi.org/10.30970/jps.04.92 MICROSCOPIC MODEL OF PHASE TRANSITION IN THE CRYSTALS OF THE DMAAlS AND DMAGaS TYPES |
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I. V. Stasyuk, O. V. Velychko
Institute for Condensed Matter Physics
of the National Academy of Sciences of Ukraine,
1 Svientsitskii Str., Lviv, UA-79011, Ukraine
The four–state model is proposed for the description of phase transition in ferroelectric crystals of the DMAGaS and DMAAlS type. Thermodynamic functions of the model are obtained in the mean field approximation. The phase transition between paraelectric and ferroelectric phases is investigated. It is established that the order of the phase transitions depends on the relations between model parameters.