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

Lalitha K.V.; Jurij Koruza; Jürgen Rödel

doi:10.1016/j.scriptamat.2019.05.013

Mechanical versus electromechanical hardening in relaxor ferroelectric Na_1/2Bi_1/2TiO₃-BaTiO₃ with ZnO inclusions

Lalitha K.V.^*, Jurij Koruza, Jürgen Rödel

^*Corresponding author for this work

Institute of Materials Science, Joining and Forming (3030)

Research output: Contribution to journal › Article › peer-review

Abstract

The stress-strain response of composites constituting relaxor 0.94Na_1/2Bi_1/2TiO₃–0.06BaTiO₃ 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 decreases with increasing volume fraction of the hard ZnO inclusions. This mechanical 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.

Original language	English
Pages (from-to)	92-95
Number of pages	4
Journal	Scripta Materialia
Volume	169
DOIs	https://doi.org/10.1016/j.scriptamat.2019.05.013
Publication status	Published - Aug 2019

Keywords

Ferroelasticity
Lead-free ferroelectrics
Mechanical hardening
Mechanical versus electromechanical hardening
Piezoelectrics

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

Access to Document

10.1016/j.scriptamat.2019.05.013

Cite this

@article{4b438f791246460fb398bdc20fa43f60,

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

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 decreases with increasing volume fraction of the hard ZnO inclusions. This mechanical 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.",

keywords = "Ferroelasticity, Lead-free ferroelectrics, Mechanical hardening, Mechanical versus electromechanical hardening, Piezoelectrics",

author = "Lalitha K.V. and Jurij Koruza and J{\"u}rgen R{\"o}del",

note = "Funding Information: Lalitha K.V. acknowledges and thanks the Alexander von Humboldt Foundation for financial support. Publisher Copyright: {\textcopyright} 2019",

year = "2019",

month = aug,

doi = "10.1016/j.scriptamat.2019.05.013",

language = "English",

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AU - Rödel, Jürgen

PY - 2019/8

Y1 - 2019/8

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AB - 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 decreases with increasing volume fraction of the hard ZnO inclusions. This mechanical 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.

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