Field-induced Domain Reorientation and Polarization Rotation of <110> Oriented Pb(Mg1/3Nb2/3)O3-PbTiO3 Single Crystals

TL;DR

This study investigates how <110> oriented Pb(Mg1/3Nb2/3)O3-PbTiO3 single crystals undergo phase transitions and polarization reorientation under electric fields, revealing complex depolarization processes beyond simple polarization reversal.

Contribution

It provides new insights into the field-induced phase transition and depolarization mechanisms in oriented relaxor ferroelectric single crystals.

Findings

Polarization reorientation and phase change occur with increasing electric field.

Depolarization is not merely the reversal of polarization.

Temperature-dependent dielectric behavior alone is insufficient to determine phase transitions.

Abstract

Polarization hysteresis loops, x-ray diffraction (XRD) and temperature dependent dielectric constant under different electric fields for <110> oriented 0.7 Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 single crystals were measured. The field-induced phase transition and the process of depolarization were discussed. The results show that with the electric field increasing, the crystal form changes along via polar-axis reorientation and polarization rotation. However, the depolarization process is not just the reversal of the polarization process. It is noticed that just from the temperature dependent dielectric behavior is not enough to judge the processes of the E-field induced phase transition.