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Field-induced phase transition in Bi1/2Na1/2TiO3-based lead-free piezoelectric ceramics

Hinterstein, Manuel and Knapp, Michael and Hölzel, Markus and Jo, Wook and Cervellino, Antonio and Ehrenberg, Helmut and Fuess, Hartmut (2010):
Field-induced phase transition in Bi1/2Na1/2TiO3-based lead-free piezoelectric ceramics.
43, In: Journal of Applied Crystallography, (6), pp. 1314-1321, ISSN 0021-8898, [Online-Edition: http://dx.doi.org/10.1107/S0021889810038264],
[Article]

Abstract

The origin of the electric field-induced strain in the polycrystalline ceramic 0.92Bi1/2Na1/2TiO3-0.06BaTiO3-0.02K1/2Na1/2NbO3 was investigated using in situ high-resolution X-ray and neutron diffraction techniques. The initially existing tetragonal phase with pseudocubic lattice undergoes a reversible phase transition to a significantly distorted rhombohedral phase under electric field, accompanied by a change in the oxygen octahedral tilting from a0a0c+ to a-a-a- and in the tilting angle. The polarization values for the tetragonal and rhombohedral phases were calculated based on the structural information from Rietveld refinements. The large recoverable electric field-induced strain is a consequence of a reversible electric field-induced phase transition from an almost nonpolar tetragonal phase to a ferroelectrically active rhombohedral phase.

Item Type: Article
Erschienen: 2010
Creators: Hinterstein, Manuel and Knapp, Michael and Hölzel, Markus and Jo, Wook and Cervellino, Antonio and Ehrenberg, Helmut and Fuess, Hartmut
Title: Field-induced phase transition in Bi1/2Na1/2TiO3-based lead-free piezoelectric ceramics
Language: English
Abstract:

The origin of the electric field-induced strain in the polycrystalline ceramic 0.92Bi1/2Na1/2TiO3-0.06BaTiO3-0.02K1/2Na1/2NbO3 was investigated using in situ high-resolution X-ray and neutron diffraction techniques. The initially existing tetragonal phase with pseudocubic lattice undergoes a reversible phase transition to a significantly distorted rhombohedral phase under electric field, accompanied by a change in the oxygen octahedral tilting from a0a0c+ to a-a-a- and in the tilting angle. The polarization values for the tetragonal and rhombohedral phases were calculated based on the structural information from Rietveld refinements. The large recoverable electric field-induced strain is a consequence of a reversible electric field-induced phase transition from an almost nonpolar tetragonal phase to a ferroelectrically active rhombohedral phase.

Journal or Publication Title: Journal of Applied Crystallography
Volume: 43
Number: 6
Uncontrolled Keywords: field-induced phase transitions; piezoelectric ceramics.
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 17 Jun 2011 12:26
Official URL: http://dx.doi.org/10.1107/S0021889810038264
Identification Number: doi:10.1107/S0021889810038264
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