%0 Journal Article
%A Rushchanskii, Konstantin
%A Bilanych, R. M.
%A Molnar, A. A.
%A Yevych, R. M.
%A Kohutych, A. A.
%A Perechinskii, S. I.
%A Samulionis, V.
%A Banys, J.
%A Vysochanskii, Y. M.
%T Ferroelectricity in (PbySn1−y)2P2S6 mixed crystals and random field BEG model
%J Physica status solidi / B
%V 253
%N 2
%@ 0370-1972
%C Weinheim
%I Wiley-VCH70889
%M FZJ-2015-07780
%P 384-391
%D 2016
%X In Sninline imagePinline imageSinline image ferroelectric under compression, the second-order phase transition line is observed down to the tricritical point as the transition temperature decreases to 250 K. A tricriticality at a similar temperature is also revealed in the mixed crystals on Sinline imageSe substitution. For the mixed crystals with Sninline imagePb substitution, ultrasound, hypersound, and low-frequency dielectric studies also show heterophase features appearing on decrease of the ferroelectric transition temperature below a so-called “waterline temperature” near 250 K. Such behavior agrees with the Blume–Emery–Griffiths (BEG) model appropriate for the ferroelectric system under investigation with a three-well local potential for the order parameter fluctuations. The BEG model modified by the random-field phase diagram in the vicinity of the tricritical point qualitatively explains the influence of the cationic substitution on the (Pbinline imageSninline image)inline imagePinline imageSinline image ferroelectric properties.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000370022300028
%R 10.1002/pssb.201552138
%U https://juser.fz-juelich.de/record/279906