Domain switching in rhombohedral PZT ceramics under electrical and mechanical loading
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Autor:
Hall, DA; Mori, T; Withers, PJ; Kungl, H; Hoffmann, MJ; Wright, J
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Quelle:
MATERIALS SCIENCE AND TECHNOLOGY, 2008, Band 24, Heft 8, S. 927-933
Abstract
Ferroelectric domain switching in rhombohedral lead zirconate titanate
(PZT) ceramics has been studied using high energy synchrotron X-ray
diffraction. The diffraction data for a range of different grain
orientations were obtained rapidly, with a data acquisition time of 20
s, using a Frelon CCD camera. Changes in the lattice strain and
ferroelectric domain fractions under an applied electric field or
compressive stress were determined by measuring the positions and
relative intensities of the diffraction peaks. It was observed that
domain switching under an electric field occurred over a narrow range of
field strength, whereas that due to a compressive stress occurred more
gradually, over a wider range of applied stress. This effect is due to a
combination of factors, including the influence of residual stress, the
presence of the electrical depolarisation field, and the nature of the
electric field and stress tensors. It was confirmed that the work
required for domain switching is the same under electrical or mechanical
loading, and approximately equal to 0˙34 MJ m−3.