Title: The second order phase transition in Sn₂P₂S₆ crystals: anharmonic oscillator model
Author(s):

	R.M. Yevych (Institute for Solid State Physics and Chemistry, Uzhgorod National University, Pidgirna Str., 46, Uzhgorod, 88000, Ukraine) ,
	Yu.M. Vysochanskii (Institute for Solid State Physics and Chemistry, Uzhgorod National University, Pidgirna Str., 46, Uzhgorod, 88000, Ukraine)

Statistical theory for ferroelectrics based on triple well anharmonic potential was used for the case of structural second order phase transition in Sn₂P₂S₆ crystals. Parameters of effective Hamiltonian of the model were estimated using available experimental data. These findings confirm the assumption that the phase transition in these crystals is located in crossover region between order-disorder and displacive type, and very closely to tricritical point.

Key words: statistical theory, anharmonic oscillator, triple well potential, ferroelctric phase transition
PACS: 63.70.+h, 77.80.Bh, 78.20.Bh

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