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Single Grains Hosting Two Space Groups: A Transmission Electron Microscopy Study of a Lead-Free Ferroelectric

Schmitt, Ljubomira A. and Kleebe, Hans-Joachim (2010):
Single Grains Hosting Two Space Groups: A Transmission Electron Microscopy Study of a Lead-Free Ferroelectric.
In: Functional Materials Letters, pp. 55-58, 03, (01), ISSN 1793-6047,
[Online-Edition: http://dx.doi.org/10.1142/s1793604710000920],
[Article]

Abstract

In this letter, conclusive experimental evidence is presented for the coexistence of two phases within individual grains in the system (Bi0.5Na0.5TiO3)0.91-(BaTiO3)0.06-(K0.5Na0.5NbO3)0.03. Electron diffraction data unequivocally reveal the presence of a rhombohedral and a tetragonal phase with space group R3c and P4bm, respectively, both on the nanoscale level. Superlattice reflections, observed in the corresponding selected area electron diffraction, were used to identify the rhombohedral and tetragonal phase present at different regions within one grain. It is thought that the rhombohedral phase acts as a nucleation site for the phase transformation monitored under applied electrical field. The coexistence of these two phases in conjunction with the triggered tetragonal to rhombohedral phase transformation rationalizes the high bipolar and unipolar strain recorded for this lead-free ferroelectric material.

Item Type: Article
Erschienen: 2010
Creators: Schmitt, Ljubomira A. and Kleebe, Hans-Joachim
Title: Single Grains Hosting Two Space Groups: A Transmission Electron Microscopy Study of a Lead-Free Ferroelectric
Language: German
Abstract:

In this letter, conclusive experimental evidence is presented for the coexistence of two phases within individual grains in the system (Bi0.5Na0.5TiO3)0.91-(BaTiO3)0.06-(K0.5Na0.5NbO3)0.03. Electron diffraction data unequivocally reveal the presence of a rhombohedral and a tetragonal phase with space group R3c and P4bm, respectively, both on the nanoscale level. Superlattice reflections, observed in the corresponding selected area electron diffraction, were used to identify the rhombohedral and tetragonal phase present at different regions within one grain. It is thought that the rhombohedral phase acts as a nucleation site for the phase transformation monitored under applied electrical field. The coexistence of these two phases in conjunction with the triggered tetragonal to rhombohedral phase transformation rationalizes the high bipolar and unipolar strain recorded for this lead-free ferroelectric material.

Journal or Publication Title: Functional Materials Letters
Volume: 03
Number: 01
Uncontrolled Keywords: Lead-free piezoceramics; domain structure; transmission electron microscopy (TEM); selected area electron diffraction; dark field imaging
Divisions: DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > B - Characterisation > Subproject B3: Structure Characterization of Piezoelectric Ceramics With Respect to Electrical Fatigue
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > B - Characterisation
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue
Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
DFG-Collaborative Research Centres (incl. Transregio)
Date Deposited: 10 Aug 2011 11:33
Official URL: http://dx.doi.org/10.1142/s1793604710000920
Additional Information:

SFB 595 B3

Identification Number: doi:10.1142/s1793604710000920
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