Investigating the importance of strain-coupling in lead-free 2-2 relaxor/ferroelectric composites with digital image correlation

Martin A, Maier J, Streich F, Kamlah M, Webber KG (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Book Volume: 31

Journal Issue: 7

DOI: 10.1088/1361-665X/ac6fa0

Abstract

Ceramic-ceramic composite structures are a viable solution to improve the electromechanical response of lead-free ferroelectrics (FEs) through tuning of the local electrical and mechanical fields. The origin of the enhanced properties, however, remains unclear, as many of the possible effects, such as polarization and strain coupling (PSC) as well as interface diffusion, are interrelated and difficult to separate or directly investigate. In this study, we use a custom-built digital image correlation system to directly investigate the influence of strain coupling on 2-2 composites consisting of 0.90Na(1/2)Bi(1/2)TiO(3)-0.06BaTiO(3)-0.04K(0.5)Na(0.5)NbO(3) (NBT-6BT-4KNN) and 0.94Na(1/2)Bi(1/2)TiO(3)-0.06BaTiO(3) (NBT-6BT) by varying the mechanical interface contacts between end members. Specifically, two model cases were utilized to separate the relative contributions of the PSC mechanisms: (a) electrically connected and (b) mechanically and electrically connected. The local strain gradient was characterized through the thickness of the composite across different layers as well as the interface, where the macroscopic large signal longitudinal and transverse FE response was determined. Experimental results reveal an enhancement of the large signal piezoelectric coefficient d33*

Authors with CRIS profile

Alexander Martin Lehrstuhl für Glas und Keramik Juliana Maier Lehrstuhl für Glas und Keramik Kyle Grant Webber Professur für Werkstoffwissenschaften (Funktionskeramik)

Additional Organisation(s)

Graduiertenkolleg 2495 Energiekonvertierungssysteme: von Materialien zu Bauteilen (Energy Conversion Systems: From Materials to Devices)

Involved external institutions

Karlsruhe Institute of Technology (KIT) Germany (DE)

How to cite

APA:

Martin, A., Maier, J., Streich, F., Kamlah, M., & Webber, K.G. (2022). Investigating the importance of strain-coupling in lead-free 2-2 relaxor/ferroelectric composites with digital image correlation. Smart Materials and Structures, 31(7). https://dx.doi.org/10.1088/1361-665X/ac6fa0

MLA:

Martin, Alexander, et al. "Investigating the importance of strain-coupling in lead-free 2-2 relaxor/ferroelectric composites with digital image correlation." Smart Materials and Structures 31.7 (2022).

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