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Structural characterization of the electric field-induced ferroelectric phase in Na0.5Bi0.5TiO3-KNbO3 ceramics

DOI: 10.1016/j.jeurceramsoc.2016.06.022 DOI Help

Authors: Ge Wang (School of Materials, University of Manchester) , David Hall (University of Manchester) , Yizhe Li (University of Manchester) , Claire Murray (Diamond Light Source) , Chiu Tang (Diamond Light Source)
Co-authored by industrial partner: No

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

State: Published (Approved)
Published: June 2016
Diamond Proposal Number(s): 10355

Abstract: (1 − x)Na0.5Bi0.5TiO3-xKNbO3(NBT-xKN) ceramics, with x in the range 0.01–0.09, were prepared by solid state reaction and conventional sintering. A progressive transformation from a nano-polar to a long-range ordered ferroelectric phase was observed after the application of a cyclic electric field with an amplitude of 5 kV mm−1. It is shown by analysis of the crushed ceramic pellets, using high resolution synchrotron x-ray diffraction, that the application the cyclic electric field induced an irreversible transformation from a pseudo-cubic nano-polar phase to a rhombohedral ordered ferroelectric phase having R3c symmetry.Furthermore, a systematic variation, from 89.6◦to 90◦, was observed in the rhombohedral interaxial angle as the KN content increased from 1 to 9%. By comparing the structural evidence with the ferroelectric polarization-electric field hysteresis loops, it is shown that the electric field-induced transformation is partially reversible for NBT-5KN and completely reversible or nonexistent for NBT-9KN.

Journal Keywords: Lead-free, Piezoelectric ceramics, Phase transition, Ferroelectric properties, Synchrotron x-ray diffraction

Subject Areas: Materials, Physics, Engineering

Instruments: I11-High Resolution Powder Diffraction