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Nanofragmentation of Ferroelectric Domains During Polarization Fatigue

Guo, Hanzheng and Liu, Xiaoming and Rödel, Jürgen and Tan, Xiaoli (2015):
Nanofragmentation of Ferroelectric Domains During Polarization Fatigue.
In: Advanced Functional Materials, pp. 270-277, 25, (2), ISSN 1616301X,
[Online-Edition: http://dx.doi.org/10.1002/adfm.201402740],
[Article]

Abstract

The microscopic mechanism for polarization fatigue in ferroelectric oxides has remained an open issue for several decades in the condensed matter physics community. Even though numerous models are proposed, a consensus has yet to be reached. Since polarization reversal is realized through ferroelectric domains, their behavior during electric cycling is critical to elucidating the microstructural origin for the deteriorating performance. In this study, electric field in situ transmission electron microscopy is employed for the first time to reveal the domain dynamics at the nanoscale through more than 103 cycles of bipolar fields. A novel mechanism of domain fragmentation is directly visualized in polycrystalline [(Bi1/2Na1/2)0.95Ba0.05]0.98La0.02TiO3. Fragmented domains break the long-range polar order and, together with domain wall pinning, contribute to the reduction of switchable polarization. Complimentary investigations into crystal structure and properties of this material corroborate our microscopic findings.

Item Type: Article
Erschienen: 2015
Creators: Guo, Hanzheng and Liu, Xiaoming and Rödel, Jürgen and Tan, Xiaoli
Title: Nanofragmentation of Ferroelectric Domains During Polarization Fatigue
Language: English
Abstract:

The microscopic mechanism for polarization fatigue in ferroelectric oxides has remained an open issue for several decades in the condensed matter physics community. Even though numerous models are proposed, a consensus has yet to be reached. Since polarization reversal is realized through ferroelectric domains, their behavior during electric cycling is critical to elucidating the microstructural origin for the deteriorating performance. In this study, electric field in situ transmission electron microscopy is employed for the first time to reveal the domain dynamics at the nanoscale through more than 103 cycles of bipolar fields. A novel mechanism of domain fragmentation is directly visualized in polycrystalline [(Bi1/2Na1/2)0.95Ba0.05]0.98La0.02TiO3. Fragmented domains break the long-range polar order and, together with domain wall pinning, contribute to the reduction of switchable polarization. Complimentary investigations into crystal structure and properties of this material corroborate our microscopic findings.

Journal or Publication Title: Advanced Functional Materials
Volume: 25
Number: 2
Uncontrolled Keywords: polarization fatigue; domain fragmentation; lead-free piezoelectrics; transmission electron microscopy
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 16 Jan 2015 09:39
Official URL: http://dx.doi.org/10.1002/adfm.201402740
Identification Number: doi:10.1002/adfm.201402740
Funders: The National Science Foundation (NSF), through Grant No. DMR- 1037898, supported this work.
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