Polarization switching in (CH3NH3)5Bi2Cl11 ferroelectric crystals by R. Z. Rogowski, K. Matyjasek, and R. Jakubas

Crystal Research and Technology

Cryst. Res. Technol. 41, 557 (2006) - Abstract -

Polarization switching in (CH₃NH₃)₅Bi₂Cl₁₁ ferroelectric crystals

R. Z. Rogowski, K. Matyjasek, and R. Jakubas*

Institute of Physics, Szczecin University of Technology, Al. Piastow 48/49, 70-310 Szczecin, Poland
*Institute of Chemistry, University of Wroclaw, F. Joliot-Curie 14, 50-383 Wroclaw, Poland

Keywords	polarization reversal, internal bias field, Avrami model
PACS	77.80.Fm, 77.80.Dj, 77.22.Ej
DOI	10.1002/crat.200510625

The polarization switching in methylammonium chlorobismuthate, (CH₃NH₃)₅Bi₂Cl₁₁, 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 (CH₃NH₃)₅Bi₂Cl₁₁ 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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