On ferroelectric single crystals' reversible domain walls motion in LF and ILF electric fields

Abstract

By the low frequency (LF) and infralow frequency (ILF) dielectric spectroscopy method we studied the domain walls reversible motion regularities in extremely weak LF and ILF electric fields for a number of ferroelectric single crystals belonging to different crystallophysical classes and types (L. A. Shuvalov's classification). It is shown that the domain walls reversible motion can be described by the relaxational equation of motion without the inertial term kx + ηx = 2P_sE, which leads to the Debye dispersion equation for crystals dielectric complex permittivity. The polarization relaxation frequency complies with the Arrenius equation v_r = v _x exp(-U/kT). It has been determined that the domain walls reversible motion makes a considerable contribution to ε* values.