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In-situ observation of evolving microstructural damage and associated effective electro-mechanical properties of PZT during bipolar electrical fatigue

Tan, Wei Lin and Faber, Katherine T. and Kochmann, Dennis M. (2019) In-situ observation of evolving microstructural damage and associated effective electro-mechanical properties of PZT during bipolar electrical fatigue. Acta Materialia, 164 . pp. 704-713. ISSN 1359-6454. https://resolver.caltech.edu/CaltechAUTHORS:20181107-112508653

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Abstract

We investigate the fatigue behavior of bulk polycrystalline lead zirconate titanate (PZT) during bipolar electric field cycling. We characterize the frequency- and cycle-dependent degradation in both the effective electro-mechanical properties (specifically, the electrical hysteresis and the macroscopic viscoelastic stiffness and damping measured by Broadband Electromechanical Spectroscopy, BES) and the microstructural damage evolution (quantified via scanning electron microscopy). The BES setup enables the mechanical characterization while performing electrical cycling so as to measure the evolving viscoelasticity without remounting the sample; particularly measuring the viscoelastic damping allows us to gain insight into the ferroelectric domain wall activity across the full electric hysteresis and over the full range of cycles. A clear dependence on the electric cycling frequency is observed in the rates of degradation of all measured properties including an up to 10% increase in dynamic compliance and a 70% decrease in electric displacement magnitude. We quantify the evolving micro-crack density across wide ranges of numbers of cycles and compare with changes in the effective compliance. Interestingly, the observed strong degradation in the ferroelectric hysteresis is contrasted by relatively mild changes in the effective viscoelastic moduli, while samples clearly indicate increasing levels of micro-damage.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.actamat.2018.10.065DOIArticle
ORCID:
AuthorORCID
Faber, Katherine T.0000-0001-6585-2536
Kochmann, Dennis M.0000-0002-9112-6615
Additional Information:© 2018 Acta Materialia Inc. Published by Elsevier Ltd. Received 6 August 2018, Revised 29 October 2018, Accepted 31 October 2018, Available online 7 November 2018. W. L. Tan acknowledges support from the DSO National Laboratories Postgraduate Scholarship.
Group:GALCIT
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Funding AgencyGrant Number
DSO National LaboratoriesUNSPECIFIED
Record Number:CaltechAUTHORS:20181107-112508653
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20181107-112508653
Official Citation:Wei Lin Tan, Katherine T. Faber, Dennis M. Kochmann, In-situ observation of evolving microstructural damage and associated effective electro-mechanical properties of PZT during bipolar electrical fatigue, Acta Materialia, Volume 164, 2019, Pages 704-713, ISSN 1359-6454, https://doi.org/10.1016/j.actamat.2018.10.065. (http://www.sciencedirect.com/science/article/pii/S1359645418308759)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90714
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:07 Nov 2018 19:30
Last Modified:03 Oct 2019 20:28

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