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| IN SITU XRD INVESTIGATION OF DOMAIN SWITCHING IN FERROELECTRIC CERAMICS PLZT DURING AN ELECTRIC FATIGUE PROCESS |
| ZHANG Ying; CHEN Zhiwu;CHENG Xuan; ZHANG Sa |
| Department of Materials Science and Engineering; Xiamen University; Xiamen 36100 |
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Cite this article:
ZHANG Ying; CHEN Zhiwu; CHENG Xuan; ZHANG Sa. IN SITU XRD INVESTIGATION OF DOMAIN SWITCHING IN FERROELECTRIC CERAMICS PLZT DURING AN ELECTRIC FATIGUE PROCESS. Acta Metall Sin, 2004, 40(12): 1299-1304 .
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Abstract An in itu XRD method was employed to identify variations of electric
domains on the surfaces of poled PLZT samples during an electric fatigue
process, and simultaneously, the related remnant polarization was measured.
The SEM observation revealed that the major fracture mode for fatigued
samples is intergranular. The diffraction intensities, I (002) and
I (200), after each cycle decreased and increased, respectively,
and their magnitudes of the increment and decrement lowered as the number of
cycles increased. It is suggested that the reduction in magnitude of
remnant polarization is caused by the reduction in numbers of
switch-able domains during a fatigue process. In addition, the incompatible
high strain induced the intergranular micro-cracks in the material,
which leads the major fracture mode for the fatigued sample
to be intergranular. The formation and the elongation of micro-cracks
in samples mainly occurred at earlier stage of electric fatigue.
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Received: 28 December 2003
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