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

Deepam Maurya, Abhijit Pramanick, Mikhail Feygenson, Joerg C. Neuefeind, Robert J. Bodnar, Shashank Priya

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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. This journal is

Original languageEnglish (US)
Pages (from-to)8423-8431
Number of pages9
JournalJournal of Materials Chemistry C
Volume2
Issue number39
DOIs
StatePublished - Oct 21 2014

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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