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Mechanical versus electromechanical hardening in relaxor ferroelectric Na1/2Bi1/2TiO3-BaTiO3 with ZnO inclusions

K.V., Lalitha and Koruza, Jurij and Rödel, Jürgen (2019):
Mechanical versus electromechanical hardening in relaxor ferroelectric Na1/2Bi1/2TiO3-BaTiO3 with ZnO inclusions.
In: Scripta Materialia, Elsevier Science Publishing, pp. 92-95, 2019, (169), ISSN 13596462, DOI: 10.1016/j.scriptamat.2019.05.013, [Online-Edition: https://doi.org/10.1016/j.scriptamat.2019.05.013],
[Article]

Abstract

The stress-strain response of composites constituting relaxor 0.94Na1/2Bi1/2TiO3–0.06BaTiO3 matrix phase with ZnO inclusions is investigated. The ZnO inclusions are found to increase the transformation stress (unpoled) for the relaxor-ferroelectric transformation and the coercive stress (poled) for domain switching. The plastic and remanent strain decreaseswith increasing volume fraction of the hard ZnO inclusions. Thismechanical hardening mechanism is contrasted quantitatively to electromechanical hardening by comparing the transformation stress and coercive stress to the poling field and coercive field respectively, as well as the corresponding plastic strain from mechanical loading to the total strain quantified by electric field loading.

Item Type: Article
Erschienen: 2019
Creators: K.V., Lalitha and Koruza, Jurij and Rödel, Jürgen
Title: Mechanical versus electromechanical hardening in relaxor ferroelectric Na1/2Bi1/2TiO3-BaTiO3 with ZnO inclusions
Language: English
Abstract:

The stress-strain response of composites constituting relaxor 0.94Na1/2Bi1/2TiO3–0.06BaTiO3 matrix phase with ZnO inclusions is investigated. The ZnO inclusions are found to increase the transformation stress (unpoled) for the relaxor-ferroelectric transformation and the coercive stress (poled) for domain switching. The plastic and remanent strain decreaseswith increasing volume fraction of the hard ZnO inclusions. Thismechanical hardening mechanism is contrasted quantitatively to electromechanical hardening by comparing the transformation stress and coercive stress to the poling field and coercive field respectively, as well as the corresponding plastic strain from mechanical loading to the total strain quantified by electric field loading.

Journal or Publication Title: Scripta Materialia
Volume: 2019
Number: 169
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Lead-free ferroelectrics Mechanical hardening Ferroelasticity Mechanical versus electromechanical hardening Piezoelectrics
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: 06 Jun 2019 06:40
DOI: 10.1016/j.scriptamat.2019.05.013
Official URL: https://doi.org/10.1016/j.scriptamat.2019.05.013
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