Kinetics of polarization switching in relaxor-ferroelectric Sr0.5Ba0.5Nb2O6 crystal doped with chromium

摘要

The kinetics of polarization reversal process in relaxor-ferroelectric Sr0.5Ba0.5Nb2O6 (SBN : 50) crystal is studied by switching current registration. The temporal behavior of the polarization is analyzed in terms of the domain dynamics. It has been found that the observed stretched-exponential behavior of the polarization relaxation can be the result of a wide distribution of relaxation times. It is suggested that the distribution of relaxation times may be attributed to a nonuniform distribution of the local coercive fields within the crystal structure.