Physics – Condensed Matter – Materials Science
Scientific paper
2007-02-13
Ferroelectrics, Vol. 223, No. 1-4, Pgs. 127-134 (1999)
Physics
Condensed Matter
Materials Science
Revised version (corrected misprints and simplified symbol notation)
Scientific paper
Macroscopic properties of ferroelectric samples, including those in form of thin films, are, to large extent, influenced by their domain structure. In this paper the free energy is calculated for a plate-like sample composed of nonferroelectric surface layers and ferroelectric central part with antiparallel domains. The sample is provided with electrodes with a defined potential difference. The effect of applied field and its small changes on the resulting domain structure is discussed. This makes it possible to determine the restoring force acting on domain walls which codetermines dielectric and piezoelectric properties of the sample. Calculations of the potential and free energy take into account interactions of opposite surfaces and are applicable also to thin films.
Bahnik T.
Fousek Jan
Kopal Alena
Mokry Pavel
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