Premium
Two relaxation processes in the inhomogeneous deuterated ferroelectric Rb 0.96 (ND 4 ) 0.04 D 2 AsO 4
Author(s) -
Trybuła Z.,
Kaszyński J.,
Łoś Sz.,
Mielcarek S.,
Trybuła M.
Publication year - 2004
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200301935
Subject(s) - ferroelectricity , dielectric , electric field , relaxation (psychology) , condensed matter physics , deuterium , materials science , permittivity , atmospheric temperature range , crystal (programming language) , dispersion (optics) , perpendicular , optics , physics , atomic physics , thermodynamics , optoelectronics , psychology , social psychology , geometry , mathematics , quantum mechanics , computer science , programming language
This paper reports the results of the influence of dc electric field on the complex permittivity ε * = ε ′ – iε ″ in the inhomogeneous deuterated ferroelectric Rb 1− x (ND 4 ) x D 2 AsO 4 , where x = 0.04 (DRADA with x = 0.04). In this crystal the coexistence of ferroelectric and short‐range ordered (glass) phases takes place at a low temperature below T c . At T c = 155 K the transition to the ferroelectric state is reported. Two relaxation processes were observed in the perpendicular orientation to the ferroelectric c ‐axis in the temperature range from 3.5 K to 300 K. The influence of a dc electric field on the temperature dependence of the dielectric losses shows clearly two different relaxation processes. At temperatures around 60 K, there is a dispersion related to the embryos of the glass clusters, which coexists with ferroelectric domains. The dispersion around 120 K due to frozen domain wall motion is also observed in the perpendicular direction to the ferroelectric c ‐axis along hydrogen bonds. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)