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Polarization switching in (CH3NH3)5Bi2Cl11 ferroelectric crystals

✍ Scribed by R. Z. Rogowski; K. Matyjasek; R. Jakubas

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
261 KB
Volume
41
Category
Article
ISSN
0232-1300

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✦ Synopsis

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.

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