Phase-Field Study of Electromechanical Coupling in Lead-Free Relaxor/Ferroelectric-Layered Composites

Wang S, Ayrikyan A, Zhang H, Webber KG, Xu BX (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Advanced Electronic Materials Wiley

Book Volume: 5

Journal Issue: 2

DOI: 10.1002/aelm.201800710

Abstract

The interface coupling effect of multilayer lead-free ceramic/ceramic relaxor/ferroelectric composites is studied by finite element-based phase-field simulations. The macroscopic electromechanical behavior of such composite systems is influenced by both polarization and strain coupling through the electrical and mechanical interaction of connected layers. Separating such interconnected phenomena is difficult experimentally. Here, we direct investigate different coupling effect by introducing soft and charge interphase layers in the serial-type layer composite model. The large strain response of the composite results from the electric field- induced nonpolar-polar phase transition of the relaxor constituent. A new relaxor phase-field model is first developed to reproduce this phase transition and parameterized by fitting the measured hysteresis loops. It is then directly compared to the experimental results of the serial-type composite composed of 0.91Bi(1/2)Na(1/2)TiO(3)-0.06BaTiO(3)-0.03AgNbO(3) and 0.93Bi(1/2)Na(1/2)TiO(3)-0.07BaTiO(3). Results show that the lateral strain coupling in the serial layer contributes considerably to the large signal piezoelectric coefficient d(33)* The primary enhancement in d(33)* is due a reduction in the remanent strain of the ferroelectric layer caused by the lateral mismatch. Moreover, charge interphase layers in the composite can introduce an internal electric field, leading to a weaker large-signal response compared with the composite with coherent interfaces.

Authors with CRIS profile

Azatuhi Ayrikyan Lehrstuhl für Glas und Keramik Kyle Grant Webber Professur für Werkstoffwissenschaften (Funktionskeramik)

Involved external institutions

Technische Universität Darmstadt DE Germany (DE) Huazhong University of Science & Technology CN China (CN)

How to cite

APA:

Wang, S., Ayrikyan, A., Zhang, H., Webber, K.G., & Xu, B.-X. (2019). Phase-Field Study of Electromechanical Coupling in Lead-Free Relaxor/Ferroelectric-Layered Composites. Advanced Electronic Materials, 5(2). https://dx.doi.org/10.1002/aelm.201800710

MLA:

Wang, Shuai, et al. "Phase-Field Study of Electromechanical Coupling in Lead-Free Relaxor/Ferroelectric-Layered Composites." Advanced Electronic Materials 5.2 (2019).

BibTeX: Download