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Polarization switching in (CH 3 NH 3 ) 5 Bi 2 Cl 11 ferroelectric crystals
Author(s) -
Rogowski R. Z.,
Matyjasek K.,
Jakubas R.
Publication year - 2006
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200510625
Subject(s) - polarization (electrochemistry) , ferroelectricity , kinetics , materials science , electric field , condensed matter physics , switching time , chemistry , optics , optoelectronics , physics , dielectric , quantum mechanics
The polarization switching in methylammonium chlorobismuthate, (CH 3 NH 3 ) 5 Bi 2 Cl 11 , single crystal was investigated by optical observations of the domain structure and switching current registration. It is shown that defects introduced during crystal growth influence the polarization switching kinetics. For the analysis of switching current data the statistical Avrami model of phase transformation kinetics was employed. Direct observation of the domain structure enabled us to verify the assumptions of the Avrami model in the case of non‐uniform (CH 3 NH 3 ) 5 Bi 2 Cl 11 crystals. It is found that application of this model to non‐uniform crystals can yield physically unclear values of some fitting parameters; e.g. the effective domain growth dimension is not constant with respect to the electric field. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)