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Compositional dependence of disordered structures in Na ½ Bi ½ TiO 3 -BaTiO 3 solid solutions

Tung, Patrick K. M. and Major, Márton and Hudspeth, Jessica and Daniels, John E. (2018):
Compositional dependence of disordered structures in Na ½ Bi ½ TiO 3 -BaTiO 3 solid solutions.
In: Materials Research Bulletin, PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND, pp. 301-306, 106, ISSN 00255408, DOI: 10.1016/j.materresbull.2018.06.019, [Online-Edition: https://doi.org/10.1016/j.materresbull.2018.06.019],
[Article]

Abstract

Disordered structures contribute to the relaxor ferroelectric properties of the lead-free system Na½Bi½TiO3-(x)%BaTiO3. Such structures are difficult to characterize with conventional structural analysis techniques. Here, diffuse X-ray scattering was used to analyze the disordered structures from four single-crystals of Na½Bi½TiO3-(x)%BaTiO3, with compositions of (x)% = 0%, 4%, 9% and 17%. Such a range of compositions allowed a distinction between the structures that occur across the morphotropic phase boundary, where enhanced electro-mechanical properties have been reported. Throughout the compositional range, the resulting diffuse scattering showed the modification of correlated atomic displacements, transformation of planar defects in the oxygen octahedral tilt-systems, and the presence of modulations of approximately 10 unit cells. The results reported here demonstrate an evolution of the short-range structures across the morphotropic phase boundary that may underpin the electro-mechanical properties of Na½Bi½TiO3-(x)%BaTiO3. This information will ultimately assist in tailoring disordered structures for next-generation piezoelectric materials.

Item Type: Article
Erschienen: 2018
Creators: Tung, Patrick K. M. and Major, Márton and Hudspeth, Jessica and Daniels, John E.
Title: Compositional dependence of disordered structures in Na ½ Bi ½ TiO 3 -BaTiO 3 solid solutions
Language: English
Abstract:

Disordered structures contribute to the relaxor ferroelectric properties of the lead-free system Na½Bi½TiO3-(x)%BaTiO3. Such structures are difficult to characterize with conventional structural analysis techniques. Here, diffuse X-ray scattering was used to analyze the disordered structures from four single-crystals of Na½Bi½TiO3-(x)%BaTiO3, with compositions of (x)% = 0%, 4%, 9% and 17%. Such a range of compositions allowed a distinction between the structures that occur across the morphotropic phase boundary, where enhanced electro-mechanical properties have been reported. Throughout the compositional range, the resulting diffuse scattering showed the modification of correlated atomic displacements, transformation of planar defects in the oxygen octahedral tilt-systems, and the presence of modulations of approximately 10 unit cells. The results reported here demonstrate an evolution of the short-range structures across the morphotropic phase boundary that may underpin the electro-mechanical properties of Na½Bi½TiO3-(x)%BaTiO3. This information will ultimately assist in tailoring disordered structures for next-generation piezoelectric materials.

Journal or Publication Title: Materials Research Bulletin
Volume: 106
Publisher: PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Uncontrolled Keywords: Oxides, Piezoelectricity, X-ray diffraction, Defects, Ferroelectricity
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Advanced Thin Film Technology
Date Deposited: 17 Jan 2019 08:43
DOI: 10.1016/j.materresbull.2018.06.019
Official URL: https://doi.org/10.1016/j.materresbull.2018.06.019
Funders: This work was supported by the Australian Government under ARC Discovery Project DP120103968 and DP130100415., P.K.M.T. acknowledges financial support from the Australian Government through an Australian Postgraduate Award., M.M. acknowledges the financial support of the DFG Collaborative Research Center SFB 595 "Electrical Fatigue in Functional Materials"., The authors acknowledge the provision of beamtime by the European Synchrotron Radiation Facility., Crystals were kindly provided by Daniel Rytz of FEE GmbH, Germany.
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