The dielectric response of (1-x) Pb (Zn1/3 Nb2/3) O3 - x PbTiO3 (PZN-x%PT,4.5x12) single crystals is reported for ac field amplitudes up to ∼2 kV/cm at 1 kHz. The Rayleigh law is used to study the dielectric nonlinear response. It is found that the extrinsic contributions are extremely anisotropic. Rhombohedral crystals poled along  C showed enhanced extrinsic contributions to their dielectric response with respect to those poled along  C, while in tetragonal crystals, the enhancement was observed for poling along  C rather than along  C. This is attributed to "domain engineering" or higher domain wall concentrations in ferroelectric crystals poled along nonpolar axes.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)