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Title of Journal: J Electroceram

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Abbravation: Journal of Electroceramics

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Springer US

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DOI

10.1002/9781119292128.ch11

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1573-8663

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Fatigue induced effects on bipolar strain loops in

Authors: Metin Ozgul Susan TrolierMckinstry Clive A Randall
Publish Date: 2007/04/07
Volume: 20, Issue: 3-4, Pages: 133-138
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Abstract

Polarization and bipolar strain hysteresis PE and SE measurements were performed simultaneously during fatigue tests performed under ac fields with a triangular wave form Rhombohedral 1xPbZn1/3Nb2/3O3−xPbTiO3 PZNPT piezo/ferroelectric single crystals demonstrate a wide variety of anisotropic behavior under bipolar electrical switching Specifically PZN45 PT crystals demonstrate exceptional polarization switching fatigue resistance along 001C c pseudocubic as opposed to normal fatigue in 111C directions This system provides an excellent opportunity to study fatigue induced effects in 111C orientation in comparison with 001C Studies in bulk ferroelectric ceramics have reported fatigueassociated strain hysteresis asymmetry In this study the evolution of bipolar strain loops was studied in both “fatiguing” 111C and “fatiguefree” 001C orientations It was found that 111C oriented PZN45 PT crystals show the onset of a strainfield asymmetry displayed by shortage of one wing of the butterfly which becomes more evident as cycling continues In contrast 001C crystals show symmetrical strainfield curves throughout cycling SE hysteresis data obtained from different points in a fatigued crystal by gently moving it between the consecutive measurements show that the shorter wing switches side indicating the local character of fatigue In comparison to the findings in polycrystalline ceramics this observation in a single crystal ferroelectric will be helpful for a better understanding of fatigue and related effects Rejuvenation studies in fatigued crystals are also reported in this paperThis work was partially supported by The Center for Dielectric Studies at Pennsylvania State University Crystals used for this study were provided by Dr T R Shrout and Dr S Zhang One of the authors M Ozgul would like to acknowledge Ministry of National Education of Turkey for the financial support provided by

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