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Effect of space charge on the polarization hysteresis characteristics of monolithic and compositionally graded ferroelectrics
 

Summary: Effect of space charge on the polarization hysteresis characteristics
of monolithic and compositionally graded ferroelectrics
M.B. Okatan a
, J.V. Mantese b
, S.P. Alpay a,*
a
Materials Science and Engineering Program, Department of Chemical, Materials, and Biomolecular Engineering, University of Connecticut,
Storrs, CT 06269, United States
b
United Technologies Research Center, East Hartford, Storrs, CT 06108, United States
Received 23 May 2009; received in revised form 13 August 2009; accepted 26 August 2009
Available online 24 September 2009
Abstract
A non-linear thermodynamic analysis of ferroelectric systems with localized space charges for monolithic and compositionally graded
materials is described wherein the electrostatic interlayer interactions are specifically accounted for. The electrostatic coupling is estab-
lished through the built-in polarization due to the space charges and the intrinsic polarization variations between the ferroelectric layers.
The findings show that the polarization hysteresis response of monolithic stress-free barium strontium titanate (BST) ferroelectrics with
asymmetrically distributed space charges result in a displacement of the hysteresis loop along the applied electric field axis. In compo-
sitionally graded BST multilayers, the hysteresis response is characterized by off-sets along both the polarization and the electric field
axes, yet with magnitudes of displacement that are markedly larger than those for monolithic ferroelectrics.

  

Source: Alpay, S. Pamir - Department of Materials Science and Engineering, University of Connecticut

 

Collections: Materials Science