Electric-field-induced polarization and strain in 0.94(Bi1/2Na1/2)TiO3-0.06BaTiO(3) under uniaxial stress

Dittmer R, Webber KG, Aulbach E, Jo W, Tan X, Rödel J (2013)

Publication Status: Published

Publication Type: Journal article

Publication year: 2013

Journal

Acta Materialia Elsevier

Publisher: Elsevier

Book Volume: 61

Pages Range: 1350-1358

DOI: 10.1016/j.actamat.2012.11.012

Abstract

The strain and polarization hystereses of lead-free 0.94Bi(1/2)Na(1/2)TiO(3)-0.06BaTiO(3) during unipolar electric field loading are obtained from room temperature to 150 degrees C under uniaxial compressive stress up to 446 MPa. At intermediate temperatures a stress-dependent peak evolves in both the maximum strain and polarization. At 125 degrees C a large strain with a large-signal piezoelectric coefficient d(33)* of 884 pm V-1 is observed, which decays upon the application of stress. This behavior is rationalized with a change in the primary strain mechanism from domain switching at low temperatures to a reversible electric field-induced transition from an ergodic relaxor state to a long-range order at high temperatures. Moreover, the energy terms w (the output mechanical work) and e(P) (the charged electrical energy density) that are related to the deformation and the polarization, respectively, are analyzed and used to define a large-signal efficiency eta* = w(w + e(P))(-1). It is found that eta* saturates at similar to 150 MPa but decreases with increasing temperature and electric field. It is furthermore observed that notable strains are achieved at stress levels even far beyond the quasi-statically determined blocking force. Therefore, it is proposed that the presented testing procedure is suited to assess the dynamic actuatoric performance of a piezoceramic. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Authors with CRIS profile

Kyle Grant Webber Professur für Werkstoffwissenschaften (Funktionskeramik)

Involved external institutions

Technische Universität Darmstadt DE Germany (DE) Iowa State University of Science and Technology (ISU) US United States (USA) (US)

How to cite

APA:

Dittmer, R., Webber, K.G., Aulbach, E., Jo, W., Tan, X., & Rödel, J. (2013). Electric-field-induced polarization and strain in 0.94(Bi1/2Na1/2)TiO3-0.06BaTiO(3) under uniaxial stress. Acta Materialia, 61, 1350-1358. https://doi.org/10.1016/j.actamat.2012.11.012

MLA:

Dittmer, Robert, et al. "Electric-field-induced polarization and strain in 0.94(Bi1/2Na1/2)TiO3-0.06BaTiO(3) under uniaxial stress." Acta Materialia 61 (2013): 1350-1358.

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