TITLE

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

AUTHOR(S)
Bernal, Ashley; Shujun Zhang; Bassiri-Gharb, Nazanin
PUB. DATE
October 2009
SOURCE
Applied Physics Letters;10/5/2009, Vol. 95 Issue 14, p142911
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The dielectric response of (1-x)Pb(Zn1/3Nb2/3)O3-xPbTiO3 (PZN-x%PT,4.5≤x≤12) 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.
ACCESSION #
44539696

 

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