Effects of orientation and composition on the extrinsic contributions to the dielectric response of relaxor-ferroelectric single crystals

Ashley Bernal, Shujun Zhang, Nazanin Bassiri-Gharb

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Abstract

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 [001] C showed enhanced extrinsic contributions to their dielectric response with respect to those poled along [111] C, while in tetragonal crystals, the enhancement was observed for poling along [111] C rather than along [001] C. This is attributed to "domain engineering" or higher domain wall concentrations in ferroelectric crystals poled along nonpolar axes.

Original languageEnglish (US)
Article number142911
JournalApplied Physics Letters
Volume95
Issue number14
DOIs
StatePublished - Oct 19 2009

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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