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

^*Korrespondierende/r Autor/-in für diese Arbeit

Institut für Werkstoffkunde, Fügetechnik und Umformtechnik (3030)

Publikation: Beitrag in einer Fachzeitschrift › Artikel › Begutachtung

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.

Originalsprache	englisch
Seiten (von - bis)	92-95
Seitenumfang	4
Fachzeitschrift	Scripta Materialia
Jahrgang	169
DOIs	https://doi.org/10.1016/j.scriptamat.2019.05.013
Publikationsstatus	Veröffentlicht - Aug. 2019

ASJC Scopus subject areas

Allgemeine Materialwissenschaften
Physik der kondensierten Materie
Werkstoffmechanik
Maschinenbau
Metalle und Legierungen

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10.1016/j.scriptamat.2019.05.013

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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",

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AU - Rödel, Jürgen

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N2 - 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.

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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