Relaxation of Polarization at the Broad Phase Transition in Modified PMN Ferroelectric Ceramics

Abstract

The reported study is focused on effects of relaxation of polarization within the range of the broad phase transition at strong sinusoidal measuring fields in modified lead magnesium niobate ceramics. The obtained results reveal an essential thermal broadening of the ϵ′(E) spectra specific to relaxor ferroelectrics. Temperature dependence of ϵ′ _eff (T) at medium fields shows two broad maximums – at T_m and at 40°C. On the basis of analysis of the experimental data, admixture of lithium is suggested to promote formation of domains in lead magnesium niobate ceramics.

Keywords:

• ferroelectrics
• ceramics
• lead magnesium niobate
• dielectric properties
• polarization