Issue 18, 2012

Nanostructured lead-free ferroelectric Na0.5Bi0.5TiO3–BaTiO3 whiskers: synthesis mechanism and structure

Abstract

Nanostructured lead-free ferroelectric Na0.5Bi0.5TiO3–BaTiO3 (NBTBT) whiskers with a high aspect ratio were synthesized topochemically using Na2Ti6O13 (NTO) as a host structure for the first time. High energy X-ray diffraction coupled with an atomic pair distribution function (PDF) and Raman scattering analyses were used to confirm the average structure of the lead-free NBTBT whiskers, which was found to be rhombohedral, i.e. a ferroelectric enabling type. High resolution transmission electron microscopic (HRTEM) analysis revealed local monoclinic-type structural distortions, indicating a modulated structure at the nanoscale in the morphotropic phase boundary (MPB) composition of the lead-free NBTBT whiskers. The structural rearrangement during the synthesis of the lead-free NBTBT whiskers was found to occur via translation of the edge shared octahedra of NTO into a corner sharing coordination. High temperature morphological changes that depict the disintegration of the isolated whiskers into their individual grains due to the higher grain boundary energy have been found to occur in close analogy with Rayleigh-type instability.

Graphical abstract: Nanostructured lead-free ferroelectric Na0.5Bi0.5TiO3–BaTiO3 whiskers: synthesis mechanism and structure

Article information

Article type
Paper
Submitted
07 Jan 2012
Accepted
03 Feb 2012
First published
06 Feb 2012

Dalton Trans., 2012,41, 5643-5652

Nanostructured lead-free ferroelectric Na0.5Bi0.5TiO3–BaTiO3 whiskers: synthesis mechanism and structure

D. Maurya, V. Petkov, A. Kumar and S. Priya, Dalton Trans., 2012, 41, 5643 DOI: 10.1039/C2DT00045H

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