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Electromechanical coupling and temperature dependent polarisation reversal in piezoelectric ceramics.

Weaver, P M; Cain, M G; Correia, T M; Stewart, M (2011) Electromechanical coupling and temperature dependent polarisation reversal in piezoelectric ceramics. IEEE Trans. Ultrason. Feroelectr. Freq. Control, 58 (9). pp. 1730-1736.

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Abstract

Electrostriction plays a central role in describing the electromechanical properties of ferroelectric materials, including widely used piezoelectric ceramics. The piezoelectric properties are closely related to the underlying electrostriction. Small field piezoelectric properties can be described as electrostriction offset by the remanent polarisation which characterises the ferroelectric state. Indeed, even large field piezoelectric effects are accurately accounted for by quadratic electrostriction. However, the electromechanical properties deviate from this simple electrostrictive description at electric fields near the coercive field. This is particularly important for actuator applications where very high electromechanical coupling can be obtained in this region.
This paper presents the results of an experimental study of electromechanical coupling in the at electric field strengths close to the coercive field of piezoelectric ceramics, and the effects of temperature on electromechanical processes during polarisation reversal. The roles of intrinsic ferroelectric strain coupling and extrinsic domain processes and their temperature dependence in determining the electromechanical response are discussed.

Item Type: Article
Subjects: Advanced Materials
Advanced Materials > Functional Materials
Identification number/DOI: 10.1109/TUFFC.2011.2010
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/5282

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