Abstract
This work presents a study of the domain reversal characteristics related to the internal bias field in nonuniform telluric acid ammonium phosphate (TAAP) crystal. We have shown that there is a direct connection between the defective structure of the crystal and stretched exponential polarization relaxation in ferroelectric crystals. The domain switching was studied by means of the nematic liquid crystal decoration technique.
Highlights
Polarization switching in an external electric field has been intensively studied and is described using classical nucleation and growth concepts of phase transformation
The single domain state, observed in stribution of domain nuclei that arise in external electric field
In sufficiently high electric fields, the intensive domain nucleation occurs upon the whole homogeneous fragment of the crystal sample (see figure 2(d))
Summary
Polarization switching in an external electric field has been intensively studied and is described using classical nucleation and growth concepts of phase transformation (e.g. the KolmogorovAvrami-Ishibashi model [1]). Relatively less has been reported on the spontaneous reversal of polarization, which occurs in the absence of an external electric field. The study of dynamics of the domain structure has been carried out in highly nonuniform TAAP crystal sample. We focus on the investigation of polarization switching dynamics in dc-fields as well as polarization decay after the removal of the electric field. These effects were examined by optical imaging of the domain structure. Microscopic observations provide information on the initial location of the polarization reversal process and its progress as a function of time
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