Title: Monoclinic elastic and piezoelectric properties of Rochelle salt. Description within the modified Mitsui model
Author(s):

	R.R.Levitskii (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii Str., 79011 Lviv, Ukraine) ,
	A.P.Moina (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii Str., 79011 Lviv, Ukraine) ,
	I.R.Zachek (Lviv Polytechnic National University, 12 Bandery Street, 79013, Lviv, Ukraine) ,

We propose a modification of the two-sublattice Mitsui model that takes into account a coupling with diagonal components of the strain tensor. Within the developed model, we calculate the piezoelectric and elastic characteristics of Rochelle salt related to those strains. In the approximation of zero thermal expansion, we find a set of the model parameters providing a satisfactory agreement with the available experimental data for the elastic constants c^E_ij and c^E_i4 and for the piezoelectric constants d_1j and g_1j.

Key words: Rochelle salt, electrostriction, piezoeffect, elastic constant
PACS: 77.80.Bh, 77.22.Ch