TY  - JOUR
AU  - Rushchanskii, Konstantin
AU  - Bilanych, R. M.
AU  - Molnar, A. A.
AU  - Yevych, R. M.
AU  - Kohutych, A. A.
AU  - Perechinskii, S. I.
AU  - Samulionis, V.
AU  - Banys, J.
AU  - Vysochanskii, Y. M.
TI  - Ferroelectricity in (PbySn1−y)2P2S6 mixed crystals and random field BEG model
JO  - Physica status solidi / B
VL  - 253
IS  - 2
SN  - 0370-1972
CY  - Weinheim
PB  - Wiley-VCH70889
M1  - FZJ-2015-07780
SP  - 384-391
PY  - 2016
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000370022300028
DO  - DOI:10.1002/pssb.201552138
UR  - https://juser.fz-juelich.de/record/279906
ER  -