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Thermodynamic Analysis of the Hysteresis Offsets from Polarization Graded Ferroelectric Materials

Published online by Cambridge University Press:  11 February 2011

Z.-G. Ban ,
S. P. Alpay  and
J. V. Mantese
Z.-G. Ban
Affiliation:
Department of Metallurgy and Materials Engineering and Institute of Materials Science, University of Connecticut, Storrs, CT 06269
S. P. Alpay
Affiliation:
Department of Metallurgy and Materials Engineering and Institute of Materials Science, University of Connecticut, Storrs, CT 06269
J. V. Mantese
Affiliation:
Delphi Research Laboratories, Shelby Township, MI 48315
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Abstract

Polarization graded ferroelectrics exhibit unconventional electrical properties that are not usually observed from homogenous ferroelectrics. Systematic spatial variations in the polarization in a ferroelectric material can be achieved by composition, temperature, and stress gradients; resulting in the displacement of the polarization vs. electric field hysteresis curve along the polarization axis. In this paper, this unusual phenomenon of hysteresis offset has been examined in BaTiO3 and BaxSr1-xTiO3 material systems using a Landau-Ginzburg phenomenological model for the first time. It is shown that the spatial non-uniformities can give rise to non-uniformities in polarization with corresponding spatial variations. This non-uniform polarization results in asymmetrical hysteresis with “up” or “down” charge offsets which are strongly dependent upon the magnitude and direction of the temperature, composition and stress gradients for three graded ferroelectrics.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 748: Symposium U – Ferroelectric Thin Films XI , 2002 , U3.10
Copyright
Copyright © Materials Research Society 2003

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References

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