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High temperature stress-induced “double loop-like” phase transitions in Bi-based perovskites

Webber, Kyle G. and Zhang, Y. and Jo, Wook and Daniels, John E. and Rödel, Jürgen (2010):
High temperature stress-induced “double loop-like” phase transitions in Bi-based perovskites.
In: Journal of Applied Physics, pp. 014101-1-014101-6, 108, (1), ISSN 00218979, [Online-Edition: http://dx.doi.org/10.1063/1.3428373],
[Article]

Abstract

Polycrystalline 0.94(Bi1/2Na1/2)TiO3–0.06BaTiO3 samples were tested under uniaxial mechanical compression at various temperatures in the vicinity of the polar tetragonal to nonpolar tetragonal phase boundary. They are shown to display double loop-like stress-strain behavior, marked by a closed ferroelastic hysteresis loop. Thus, it forms a mechanical analog to the polarization-electric field hysteresis behavior of barium titanate above the Curie temperature. As temperature is increased there is an apparent loss of macroscopically observable ferroelasticity, despite the persistence of tetragonality. Macroscopic experimental results are discussed in conjunction with temperature-dependent and stress-dependent high-energy x-ray diffraction data. This reveals a phase transition below the Curie temperature, marked by a discontinuous change in lattice parameters and octahedral tilting during compressive mechanical loading.

Item Type: Article
Erschienen: 2010
Creators: Webber, Kyle G. and Zhang, Y. and Jo, Wook and Daniels, John E. and Rödel, Jürgen
Title: High temperature stress-induced “double loop-like” phase transitions in Bi-based perovskites
Language: English
Abstract:

Polycrystalline 0.94(Bi1/2Na1/2)TiO3–0.06BaTiO3 samples were tested under uniaxial mechanical compression at various temperatures in the vicinity of the polar tetragonal to nonpolar tetragonal phase boundary. They are shown to display double loop-like stress-strain behavior, marked by a closed ferroelastic hysteresis loop. Thus, it forms a mechanical analog to the polarization-electric field hysteresis behavior of barium titanate above the Curie temperature. As temperature is increased there is an apparent loss of macroscopically observable ferroelasticity, despite the persistence of tetragonality. Macroscopic experimental results are discussed in conjunction with temperature-dependent and stress-dependent high-energy x-ray diffraction data. This reveals a phase transition below the Curie temperature, marked by a discontinuous change in lattice parameters and octahedral tilting during compressive mechanical loading.

Journal or Publication Title: Journal of Applied Physics
Volume: 108
Number: 1
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 > Elektromechanik von Oxiden
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
Date Deposited: 17 Jun 2011 13:59
Official URL: http://dx.doi.org/10.1063/1.3428373
Identification Number: doi:10.1063/1.3428373
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