Title: Thermodynamic and dynamic dielectric properties of one-dimensional hydrogen bonded ferroelectric of PbHPO4<\sub>-type
Author(s):

	I.R. Zachek (Lviv Polytechnic National University, 12 Bandera Str., 79013 Lviv, Ukraine) ,
	R.R. Levitskii (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii str, 79011 Lviv, Ukraine) ,
	Ya. Shchur (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii str, 79011 Lviv, Ukraine) ,
	O.B. Bilenka (Lviv Polytechnic National University, 12 Bandera Str., 79013 Lviv, Ukraine)

Within the modified model of proton ordering of one-dimensional ferroelectric having hydrogen bonds of PbHPO₄-type, their thermodynamic and dynamic characteristics are studied and calculated taking into account the linear (by crystal deformations ϵ_i (i=1,3) and ϵ₄) contributions into the energy of a proton system but without taking into account the tunneling in the two-particle cluster approximation. There has been obtained a good quantitative description of the temperature dependence of polarization, static dielectric permittivity, heat capacity and frequency dependence of dynamic dielectric permittivity at different temperatures for PbHPO₄ and PbHDO₄ crystals.

Key words: : ferroelectric, dielectric permittivity, piezoelectric coefficient, PbHPO₄
PACS: 77.22.Ch, 77.22.Gm, 77.65.Bn 77.84.Fa, 77.65.Fs

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