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Uniaxial compressive stress and temperature dependent mechanical behavior of (1- x )BiFeO 3 - x BaTiO 3 lead-free piezoelectric ceramics

Khansur, Neamul H. and Glaum, Julia and Clemens, Oliver and Zhang, Hailong and Daniels, John E. and Webber, Kyle G. (2017):
Uniaxial compressive stress and temperature dependent mechanical behavior of (1- x )BiFeO 3 - x BaTiO 3 lead-free piezoelectric ceramics.
In: Ceramics International, 43 (12), pp. 9092-9098. Elsevier Science Publishing, ISSN 02728842,
DOI: 10.1016/j.ceramint.2017.04.055,
[Article]

Abstract

The mechanical behavior of polycrystalline lead-free (1-x)BiFeO3-xBaTiO3 (BF-BT) piezoelectric ceramics was investigated under uniaxial compressive stress from room temperature up to 400 °C with macroscopic stress-strain measurements and in situ stress-dependent neutron diffraction. Stress-strain curves revealed a changing mechanical response with BaTiO3 content and temperature. With decreasing BaTiO3 content there was an increase in the coercive stress, which reduced the remanent strain and hysteresis. Full pattern structural refinement of the neutron data reveals both rhombohedral distortion and magnetic moment decreases with increasing BaTiO3 content. In situ stress-dependent neutron diffraction experiments showed that accommodation of external stress occurs through the changes in tilt magnitude and anisotropy of oxygen octahedra at room temperature. The origin of stress-induced strain at room temperature is a lattice deformation without any apparent change in average crystallographic symmetry or domain switching. Temperature-dependent in situ stress-induced measurement of BF-30BT showed maximum strain close to the rhombohedral - pseudocubic transition temperature, which has been proposed to be due to the lattice deformation as well as to the differing degree of tilting of the (Fe/Ti)O6 octahedra.

Item Type: Article
Erschienen: 2017
Creators: Khansur, Neamul H. and Glaum, Julia and Clemens, Oliver and Zhang, Hailong and Daniels, John E. and Webber, Kyle G.
Title: Uniaxial compressive stress and temperature dependent mechanical behavior of (1- x )BiFeO 3 - x BaTiO 3 lead-free piezoelectric ceramics
Language: English
Abstract:

The mechanical behavior of polycrystalline lead-free (1-x)BiFeO3-xBaTiO3 (BF-BT) piezoelectric ceramics was investigated under uniaxial compressive stress from room temperature up to 400 °C with macroscopic stress-strain measurements and in situ stress-dependent neutron diffraction. Stress-strain curves revealed a changing mechanical response with BaTiO3 content and temperature. With decreasing BaTiO3 content there was an increase in the coercive stress, which reduced the remanent strain and hysteresis. Full pattern structural refinement of the neutron data reveals both rhombohedral distortion and magnetic moment decreases with increasing BaTiO3 content. In situ stress-dependent neutron diffraction experiments showed that accommodation of external stress occurs through the changes in tilt magnitude and anisotropy of oxygen octahedra at room temperature. The origin of stress-induced strain at room temperature is a lattice deformation without any apparent change in average crystallographic symmetry or domain switching. Temperature-dependent in situ stress-induced measurement of BF-30BT showed maximum strain close to the rhombohedral - pseudocubic transition temperature, which has been proposed to be due to the lattice deformation as well as to the differing degree of tilting of the (Fe/Ti)O6 octahedra.

Journal or Publication Title: Ceramics International
Journal volume: 43
Number: 12
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: C. Piezoelectric properties, C. Mechanical properties, D. Perovskite, E. Functional applications
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 > Fachgebiet Materialdesign durch Synthese
Date Deposited: 17 Aug 2017 11:09
DOI: 10.1016/j.ceramint.2017.04.055
Official URL: https://doi.org/10.1016/j.ceramint.2017.04.055
Funders: N.H.K. and K.G.W. gratefully acknowledge the financial support from the Deutsche Forschungsgemeinschaft (DFG) under grant WE 4972/2., O.C. acknowledges support from DFG under grant CL551/2-1., J.G. acknowledges support from the Australian Research Council under grant No. DE120102644., J.E.D acknowledges support from the Australian Research Council under grant No. DP120103968., The Australian Centre for Neutron Scattering at the Australian Nuclear Science and Technology Organisation (ANSTO) is acknowledged for provision of the neutron diffraction facilities through program proposal number P2296., Authors would like to acknowledge the support of the beamline scientists Vladimir Luzin and Andrew Studer.
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