Nonlinear Dielectric Response of Relaxor PMN-PZT Ceramics under DC Electric Field

Abstract

The dielectric behaviors of (1−x)Pb(Mg_1/3Nb_2/3)O₃−xPb(Zr_0.53Ti_0.47)O₃ (PMN-PZT) relaxor ferroelectric ceramics of several compositions (x = 0.05–0.30) have been studied under high bias electric field. The dielectric constant decay with dc electric field was observed in the range of diffuse phase transitions. The nonlinear dielectric response was considered in frames of thermodynamic approach. It was shown also that all dielectric features may be understood using a model involving heterogeneous polar micro- and nanoregions.

Keywords:

• Relaxor
• permittivity
• bias field
• nonlinearity
• PMN-PZT solid solution

Acknowledgments

The work was supported by the Ministry of Education of Russian Federation under grant No 203.03.02.038 and by the CRDF Project under grant VZ-010.