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Revealing the sequence of switching mechanisms in polycrystalline ferroelectric/ferroelastic materials

Schultheiß, Jan and Liu, Lisha and Kungl, Hans and Weber, Michael and Lalitha, K. V. and Checchia, Stefano and Damjanovic, Dragan and Daniels, John E. and Koruza, Jurij (2018):
Revealing the sequence of switching mechanisms in polycrystalline ferroelectric/ferroelastic materials.
In: Acta Materialia, Elsevier, pp. 355-363, 2018, (157), ISSN 13596454, DOI: 10.1016/j.actamat.2018.07.018, [Article]

Abstract

Ferroelectric materials find application in numerous electronic devices and are continuously enabling the development of new technologies. Their versatility is intimately related to the unique property to switch the polarization with electric fields. However, the switching mechanisms in polycrystalline ferroelectric materials remain insufficiently understood. Here we reveal that switching in ferroelectric/ferroelastic materials consists of a sequence of individual events, separated into three regimes: rapid movement of non-180° domain walls, main switching phase with 180° and non-180° switching events, and creep-like non-180° domain wall movement. The determination of the mechanisms was enabled by a novel measurement approach, simultaneously tracking the time dynamics of switched polarization, macroscopic strain, and structural changes. Time-resolved in situ synchrotron diffraction allowed direct insight into the non-180° domain wall dynamics and lattice strains and gave evidence for strong time correlation of non-180° switching events in different grains of the polycrystalline material. The obtained results open new opportunities for targeted manipulation of individual switching events and tuning of material's functional properties.

Item Type: Article
Erschienen: 2018
Creators: Schultheiß, Jan and Liu, Lisha and Kungl, Hans and Weber, Michael and Lalitha, K. V. and Checchia, Stefano and Damjanovic, Dragan and Daniels, John E. and Koruza, Jurij
Title: Revealing the sequence of switching mechanisms in polycrystalline ferroelectric/ferroelastic materials
Language: English
Abstract:

Ferroelectric materials find application in numerous electronic devices and are continuously enabling the development of new technologies. Their versatility is intimately related to the unique property to switch the polarization with electric fields. However, the switching mechanisms in polycrystalline ferroelectric materials remain insufficiently understood. Here we reveal that switching in ferroelectric/ferroelastic materials consists of a sequence of individual events, separated into three regimes: rapid movement of non-180° domain walls, main switching phase with 180° and non-180° switching events, and creep-like non-180° domain wall movement. The determination of the mechanisms was enabled by a novel measurement approach, simultaneously tracking the time dynamics of switched polarization, macroscopic strain, and structural changes. Time-resolved in situ synchrotron diffraction allowed direct insight into the non-180° domain wall dynamics and lattice strains and gave evidence for strong time correlation of non-180° switching events in different grains of the polycrystalline material. The obtained results open new opportunities for targeted manipulation of individual switching events and tuning of material's functional properties.

Journal or Publication Title: Acta Materialia
Volume: 2018
Number: 157
Publisher: Elsevier
Uncontrolled Keywords: Ferroelectric Domain switching Electroceramics High-energy X-ray diffraction Gibbs energy
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
Date Deposited: 02 Aug 2018 06:28
DOI: 10.1016/j.actamat.2018.07.018
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