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Influence of uniaxial stress on the ferroelectric-to-paraelectric phase change in barium titanate

Schader, Florian H. and Aulbach, Emil and Webber, Kyle G. and Rossetti, George A. (2013):
Influence of uniaxial stress on the ferroelectric-to-paraelectric phase change in barium titanate.
113, In: Journal of Applied Physics, (17), pp. 174103(1-9), ISSN 00218979, [Online-Edition: http://dx.doi.org/10.1063/1.4799581],
[Article]

Abstract

The dielectric behavior near the ferroelectric-to-paraelectric phase transition of 〈001〉C-oriented single crystal and polycrystalline barium titanate (BaTiO3) was investigated as a function of uniaxial compressive stress in the temperature range from 25 to 200 °C. An increase in the Curie point (TC) and decrease in the Curie-Weiss temperature (θ) were observed with increasing stress for both single crystal and polycrystalline samples, resulting in an increase in the first order nature of the phase transition as measured by the temperature difference (TC – θ). With increasing applied stress levels, the permittivity versus temperature curves of polycrystalline samples were found to broaden and flatten near the Curie point, which was not observed for the single crystals. The experimental results were analyzed using a classical 2-4-6 Landau polynomial. The observed increase in the first order nature of the ferroelectric-to-paraelectric phase transition with uniaxial stress was explained by a linear dependence of the quartic coefficient of the Landau series on stress.

Item Type: Article
Erschienen: 2013
Creators: Schader, Florian H. and Aulbach, Emil and Webber, Kyle G. and Rossetti, George A.
Title: Influence of uniaxial stress on the ferroelectric-to-paraelectric phase change in barium titanate
Language: English
Abstract:

The dielectric behavior near the ferroelectric-to-paraelectric phase transition of 〈001〉C-oriented single crystal and polycrystalline barium titanate (BaTiO3) was investigated as a function of uniaxial compressive stress in the temperature range from 25 to 200 °C. An increase in the Curie point (TC) and decrease in the Curie-Weiss temperature (θ) were observed with increasing stress for both single crystal and polycrystalline samples, resulting in an increase in the first order nature of the phase transition as measured by the temperature difference (TC – θ). With increasing applied stress levels, the permittivity versus temperature curves of polycrystalline samples were found to broaden and flatten near the Curie point, which was not observed for the single crystals. The experimental results were analyzed using a classical 2-4-6 Landau polynomial. The observed increase in the first order nature of the ferroelectric-to-paraelectric phase transition with uniaxial stress was explained by a linear dependence of the quartic coefficient of the Landau series on stress.

Journal or Publication Title: Journal of Applied Physics
Volume: 113
Number: 17
Uncontrolled Keywords: barium compounds, compressive strength, ferroelectric Curie temperature, ferroelectric materials, Landau levels, permittivity
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: 03 May 2013 10:41
Official URL: http://dx.doi.org/10.1063/1.4799581
Identification Number: doi:10.1063/1.4799581
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