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Critical mechanical and electrical transition behavior of BaTiO3: The observation of mechanical double loop behavior

Picht, Gunnar and Webber, Kyle G. and Zhang, Yining and Kungl, Hans and Damjanovic, Dragan and Hoffmann, Michael J. (2012):
Critical mechanical and electrical transition behavior of BaTiO3: The observation of mechanical double loop behavior.
In: Journal of Applied Physics, pp. 124101(1-9), 112, (12), ISSN 00218979,
[Online-Edition: http://dx.doi.org/10.1063/1.4767059],
[Article]

Abstract

Strain response of polycrystalline barium titanate (BaTiO3) was investigated under high unipolar electric field (0 to 4 kV/mm) and compressive stress (0 to 400 MPa) in the temperature range from 25 to 160 °C. In the vicinity of the Curie point (TC), nonlinear and hysteretic strain-electric field and strain-stress constitutive behaviors were observed, persisting above TC where they correspond to the well-known electric field induced double loop polarization behavior. Analogous to the electrical double loops, the mechanical (strain-stress) hysteretic behavior above TC is caused by a stress induced phase transition from the paraelectric/paraelastic to ferroelectric/ferroelastic phase; the electro-elastic (strain-electric field) hysteresis is similarly caused by an electric field induced phase transition. The stress and electric field at which transitions occur increase linearly with increasing temperature, exhibiting critical behavior typical for the first order phase transitions. The temperature limit for the induced phase transition extends up to 12 °C over TC. Results are discussed in relation to the Landau-Ginzburg-Devonshire free energy expansion.

Item Type: Article
Erschienen: 2012
Creators: Picht, Gunnar and Webber, Kyle G. and Zhang, Yining and Kungl, Hans and Damjanovic, Dragan and Hoffmann, Michael J.
Title: Critical mechanical and electrical transition behavior of BaTiO3: The observation of mechanical double loop behavior
Language: English
Abstract:

Strain response of polycrystalline barium titanate (BaTiO3) was investigated under high unipolar electric field (0 to 4 kV/mm) and compressive stress (0 to 400 MPa) in the temperature range from 25 to 160 °C. In the vicinity of the Curie point (TC), nonlinear and hysteretic strain-electric field and strain-stress constitutive behaviors were observed, persisting above TC where they correspond to the well-known electric field induced double loop polarization behavior. Analogous to the electrical double loops, the mechanical (strain-stress) hysteretic behavior above TC is caused by a stress induced phase transition from the paraelectric/paraelastic to ferroelectric/ferroelastic phase; the electro-elastic (strain-electric field) hysteresis is similarly caused by an electric field induced phase transition. The stress and electric field at which transitions occur increase linearly with increasing temperature, exhibiting critical behavior typical for the first order phase transitions. The temperature limit for the induced phase transition extends up to 12 °C over TC. Results are discussed in relation to the Landau-Ginzburg-Devonshire free energy expansion.

Journal or Publication Title: Journal of Applied Physics
Volume: 112
Number: 12
Uncontrolled Keywords: barium compounds, ferroelastic transitions, ferroelectric Curie temperature, ferroelectric materials, free energy, internal stresses, stress-strain relations
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: 24 Jan 2013 13:07
Official URL: http://dx.doi.org/10.1063/1.4767059
Identification Number: doi:10.1063/1.4767059
Funders: K.G.W. gratefully acknowledges the Deutsche Forschungsgemeinschaft for support under WE 4972/1-1.
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