Achieving large electric-field-induced strain in lead-free piezoelectrics. Issue 5 (4th May 2019)

• Record Type: Journal Article
• Authors: Tung, Patrick; Daniels, John E.; Major, Márton; Schneider, Deborah; Chen, Richard; Luo, Haosu; Granzow, Torsten
• Is Part Of: Materials research letters. Volume 7:Issue 5(2019)
• Page Start: 173
• Page End: 179
• Publication Date: 2019-05-04
• Subjects: Piezoelectricity -- relaxor ferroelectrics -- field-induced phase transitions; Materials science -- Research -- Periodicals; Biomedical materials -- Research -- Periodicals; Composite materials -- Research -- Periodicals; Biomedical materials -- Research; Composite materials -- Research; Materials science -- Research; Periodicals; 620.1105
• DOI: 10.1080/21663831.2019.1570979
• Languages: English
• ISSNs: 2166-3831

Abstract

ABSTRACT: Lead-free piezoelectric single crystals of Fe-doped 0.95(Bi1/2 Na1/2 )TiO3 -0.05BaTiO3 are shown to combine multiple mechanisms for high strain and an effective piezoelectric coefficient of up to 3260 pm/V. This is explained based on the analysis of superstructure reflections from diffuse synchrotron x-ray scattering. It depends on three factors: (1) the stabilization of a local tetragonal structure by (Fe'-V O ∙ ∙ ) defect dipoles, (2) the reversible creation of a morphotropic phase boundary under field, and (3) the field-induced reversible transition between a short-range ordered relaxor and a long-range ordered ferroelectric state. GRAPHICAL ABSTRACT: IMPACT STATEMENT: The observation that a combination of three different physical mechanisms produces unprecedently high piezoelectric response in a lead-free piezoelectric presents a breakthrough in the fundamental understanding of optimizing piezoelectric properties.