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Issue 39, 2014
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Effect of poling on nanodomains and nanoscale structure in A-site disordered lead-free piezoelectric Na0.5Bi0.5TiO3–BaTiO3

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Abstract

This paper establishes the nanoscale poling mechanism operating in A-site disordered lead-free piezoelectric ceramics. Nanoscale domain maps and quantitative structural changes were obtained by deploying high-resolution transmission electron microscopy, dielectric spectroscopy, Raman spectroscopy and neutron scattering. Based on these results a microscopic model is proposed that provides insight into the E-field induced structural transformation. The stripe-like nanodomains in the unpoled system transformed into lamellar tetragonal domains with a reduced degree of displacement disorder during poling. It is proposed that the synergic effect of change in octahedral tilt disorder and cation displacement disorder leads to this transformation under an E-field. The criterion for achieving superior functional response includes stabilization of the long range order and reduction in the tilt disorder through compositional adjustments. Understanding of the poling mechanism in lead-free piezoelectric materials has been mostly limited to the behavior of domains under an applied field. However, this work provides an in-depth understanding of the changes in the local structure along with domain morphology under an applied field.

Graphical abstract: Effect of poling on nanodomains and nanoscale structure in A-site disordered lead-free piezoelectric Na0.5Bi0.5TiO3–BaTiO3

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Publication details

The article was received on 29 May 2014, accepted on 10 Aug 2014 and first published on 13 Aug 2014


Article type: Paper
DOI: 10.1039/C4TC01124D
Citation: J. Mater. Chem. C, 2014,2, 8423-8431
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    Effect of poling on nanodomains and nanoscale structure in A-site disordered lead-free piezoelectric Na0.5Bi0.5TiO3–BaTiO3

    D. Maurya, A. Pramanick, M. Feygenson, J. C. Neuefeind, R. J. Bodnar and S. Priya, J. Mater. Chem. C, 2014, 2, 8423
    DOI: 10.1039/C4TC01124D

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