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Theory of Switching in Bulk First-Order Ferroelectric Materials

✍ Scribed by Eng-Kiang Tan; J. Osman; D.R. Tilley

Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
202 KB
Volume
228
Category
Article
ISSN
0370-1972

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✦ Synopsis

A detailed account of switching and related properties of bulk first-order ferroelectric materials is given. The ferroelectric is described by the Landau-Devonshire free energy and all the results are given in terms of dimensionless variables so that they are generally applicable. In the first part of the paper the static properties are discussed. The forms of the dielectric hysteresis loop in various temperature ranges are presented and analytic results are derived for the two coercive fields that are needed for a description of the hysteresis. Switching is described by means of the Landau-Khalatnikov dynamical equation, and analytic expressions for the maximum and minimum switching currents are derived. The equation is solved numerically to find switching characteristics for an applied step field and the hysteretic response to a sinusoidal field.

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