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A distributed step-like switching model of the continuous field-driven phase transformations observed in PMN–xPT relaxor ferroelectric single crystals

Webber, Kyle G. and Robinson, Harold C. and Rossetti Jr., George A. and Lynch, Christopher S. (2008):
A distributed step-like switching model of the continuous field-driven phase transformations observed in PMN–xPT relaxor ferroelectric single crystals.
In: Acta Materialia, pp. 2744-2749, 56, (12), ISSN 13596454, [Online-Edition: http://dx.doi.org/10.1016/j.actamat.2008.02.006],
[Article]

Abstract

The field-driven phase transformation behavior of relaxor ferroelectric single crystal PZN–xPT is discontinuous and displays well-defined forward and reverse coercive fields, whereas the same transformation in PMN–xPT is nearly continuous and occurs over a range of field levels. In analogy to the broad Curie range in relaxor ferroelectrics arising from property fluctuations at the nanometer length scale, the continuous field-driven phase transformations in PMN–xPT are modeled as a step-like series of discontinuous transformations associated with similar spatial property fluctuations. An increase in the applied field gradually increases the volume fraction of the new phase at the expense of the old phase, resulting in a continuous transition between phases. The model simulation produces excellent agreement with the measured material response of 〈0 1 1〉 cut PMN–0.32PT single crystals under conditions of cooperative stress and electric field loading.

Item Type: Article
Erschienen: 2008
Creators: Webber, Kyle G. and Robinson, Harold C. and Rossetti Jr., George A. and Lynch, Christopher S.
Title: A distributed step-like switching model of the continuous field-driven phase transformations observed in PMN–xPT relaxor ferroelectric single crystals
Language: English
Abstract:

The field-driven phase transformation behavior of relaxor ferroelectric single crystal PZN–xPT is discontinuous and displays well-defined forward and reverse coercive fields, whereas the same transformation in PMN–xPT is nearly continuous and occurs over a range of field levels. In analogy to the broad Curie range in relaxor ferroelectrics arising from property fluctuations at the nanometer length scale, the continuous field-driven phase transformations in PMN–xPT are modeled as a step-like series of discontinuous transformations associated with similar spatial property fluctuations. An increase in the applied field gradually increases the volume fraction of the new phase at the expense of the old phase, resulting in a continuous transition between phases. The model simulation produces excellent agreement with the measured material response of 〈0 1 1〉 cut PMN–0.32PT single crystals under conditions of cooperative stress and electric field loading.

Journal or Publication Title: Acta Materialia
Volume: 56
Number: 12
Uncontrolled Keywords: Dielectrics; Electroceramics; Perovskites; Ferroelectricity; Piezoelectricity
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Elektromechanik von Oxiden
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
Date Deposited: 24 Jan 2013 12:50
Official URL: http://dx.doi.org/10.1016/j.actamat.2008.02.006
Identification Number: doi:10.1016/j.actamat.2008.02.006
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