Condensed Matter Physics,
1997, No 10, p. 67-92, English
DOI:10.5488/CMP.10.67
Title: STATISTICAL THEORY FOR DISORDERED QUASI-ONE-DIMENSIONAL
FERROELECTRICS WITH HYDROGEN BONDS
Authors: R.R.Levitskii, R.O.Sokolovskii, S.I.Sorokov (Institute for
Condensed
Matter Physics of the National Academy of Sciences of Ukraine,
1 Svientsitskii St., 290011 Lviv-11, Ukraine)
Thermodynamics and dynamics of the quasi-one-dimensional disordered
ferroelectrics with hydrogen bonds are studied within the framework of
disordered Ising model. We obtain thermodynamic potentials, polarization,
static and dynamic q-dependent susceptibilities within the
two-site cluster approximation for short-range interactions. Theoretical
results are compared to dielectric meusurements in pure and partially
deuterated ferroelectrics Cs(H_{1-x}D_x)_2PO_4 and PbH(D)PO_4. The
model predicts the sort ordering in the former crystal: protons and
deuterons tend to occupy the nearest neighbour H-bonds.
Comments: Figs. 9, Refs. 52, Tabs. 2.