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Electric field‐induced irreversible relaxor to ferroelectric phase transformations in Na 0.5 Bi 0.5 TiO 3 ‐NaNbO 3 ceramics

DOI: 10.1111/jace.16676 DOI Help

Authors: Ge Wang (University of Sheffield; University of Manchester) , Zhilun Lu (University of Sheffield) , Zhenbo Zhang (University of Manchester) , Antonio. Feteira (Sheffield Hallam University) , Chiu C. Tang (Diamond Light Source) , David A. Hall (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of The American Ceramic Society

State: Published (Approved)
Published: July 2019
Diamond Proposal Number(s): 8699

Abstract: (1-x)Na0.5Bi0.5TiO3-xNaNbO3 (x=0.02, 0.04, 0.06 and 0.08) ceramics were fabricated by solid state reaction. High-resolution synchrotron x-ray powder diffraction (SXPD) data, coupled with macroscopic electromechanical measurements, reveal the occurrence of an electric field-induced irreversible crystallographic transformation for x=0.02 and 0.04, from a pseudo-cubic non-ergodic relaxor to a rhombohedral or coexisting rhombohedral-tetragonal long range-ordered ferroelectric phase respectively. The highest unipolar electrostrain, corresponding to an effective longitudinal piezoelectric strain coefficient of approximately 340 pm V-1, was obtained for x=0.04; this effect is attributed to enhanced domain switching as a result of the co-existing rhombohedral and tetragonal phases for this composition, which is critical for piezoelectric actuator applications.

Journal Keywords: sodium bismuth titanate; phase transformation; high-resolution synchrotron x-ray diffraction; ferroelectric; relaxor ferroelectric

Subject Areas: Materials, Energy, Physics


Instruments: I11-High Resolution Powder Diffraction