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Thermodynamic analysis of temperature-graded ferroelectrics S. P. Alpaya)

Summary: Thermodynamic analysis of temperature-graded ferroelectrics
S. P. Alpaya)
and Z.-G. Ban
Department of Metallurgy and Materials Engineering and Institute of Materials Science,
University of Connecticut, Storrs, Connecticut 06269
J. V. Mantese
Delphi Research Laboratories, Shelby Township, Michigan 48315
Received 4 November 2002; accepted 4 January 2003
A Landau­Ginzburg thermodynamic model is constructed and used to develop a methodology for
analyzing temperature-graded ferroelectrics. Spatial nonuniformities in temperature are shown to
give rise to nonuniformities in polarization with corresponding spatial variations. The magnitude
and the sign of the polarization gradients are shown to depend on the imposed temperature gradient.
The polarization gradients result in asymmetric hysteresis responses with ``up'' or ``down'' charge
offsets. The theoretical analysis presented here not only predicts the general trends associated with
the hysteresis offsets observed from temperature-graded ferroelectrics, but is also in excellent
quantitative agreement with the experimental data reported in the literature W. Fellberg, J. V.
Mantese, N. W. Schubring, and A. L. Micheli, Appl. Phys. Lett. 78, 524 2001 . © 2003 American
Institute of Physics. DOI: 10.1063/1.1556565
In recent years, there has been great interest in graded
ferroelectrics as they exhibit behavior and properties that are


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


Collections: Materials Science