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Stress-dependent electromechanical properties of doped (Ba1−xCax)(ZryTi1−y)O3

Humburg, Heide and Acosta, Matias and Jo, Wook and Webber, Kyle G. and Rödel, Jürgen (2014):
Stress-dependent electromechanical properties of doped (Ba1−xCax)(ZryTi1−y)O3.
In: Journal of the European Ceramic Society, Elsevier, pp. 1209-1217, 35, ISSN 09552219, [Online-Edition: http://dx.doi.org/10.1016/j.jeurceramsoc.2014.10.016],
[Article]

Abstract

The effect of 1 at% Fe- and FeNb-doping on the temperature and stress stability of the electromechanical properties of (Ba1−xCax)(ZryTi1−y)O3 (BCZT) was investigated. For the composition (Ba0.89Ca0.11)(Zr0.135Ti0.865)O3 with rhombohedral symmetry, doping reduces the Curie point and the temperature stability of the large-signal electromechanical properties significantly. The large-signal piezoelectric coefficientd33 ∗ at room temperature was reduced to 500 pm/V compared to 700 pm/V in the undoped composition at 1 kV/mm. The electrostrain, however, was found to be less sensitive to mechanical prestresses, showing a plateau up to stresses of 80 MPa in both doped compositions. These effects were attributed to a reduction of the domain wall mobility due to a smaller grain size, charged defect dipoles and the proximity of the room-temperature measurements to the reduced ferroelectric-paraelectric phase transition temperature. The study reveals that the exceptionally large strains observed in BCZT rely on the instabilities around the polymorphic phase transition in the system. Aliovalent doping changes this sensitive system and reduces the electrostrain considerably.

Item Type: Article
Erschienen: 2014
Creators: Humburg, Heide and Acosta, Matias and Jo, Wook and Webber, Kyle G. and Rödel, Jürgen
Title: Stress-dependent electromechanical properties of doped (Ba1−xCax)(ZryTi1−y)O3
Language: English
Abstract:

The effect of 1 at% Fe- and FeNb-doping on the temperature and stress stability of the electromechanical properties of (Ba1−xCax)(ZryTi1−y)O3 (BCZT) was investigated. For the composition (Ba0.89Ca0.11)(Zr0.135Ti0.865)O3 with rhombohedral symmetry, doping reduces the Curie point and the temperature stability of the large-signal electromechanical properties significantly. The large-signal piezoelectric coefficientd33 ∗ at room temperature was reduced to 500 pm/V compared to 700 pm/V in the undoped composition at 1 kV/mm. The electrostrain, however, was found to be less sensitive to mechanical prestresses, showing a plateau up to stresses of 80 MPa in both doped compositions. These effects were attributed to a reduction of the domain wall mobility due to a smaller grain size, charged defect dipoles and the proximity of the room-temperature measurements to the reduced ferroelectric-paraelectric phase transition temperature. The study reveals that the exceptionally large strains observed in BCZT rely on the instabilities around the polymorphic phase transition in the system. Aliovalent doping changes this sensitive system and reduces the electrostrain considerably.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 35
Publisher: Elsevier
Uncontrolled Keywords: BZT-BCT; Doping; Piezoelectric properties; Lead-free; Ferroelasticity
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 > Nonmetallic-Inorganic Materials
Date Deposited: 03 Nov 2015 10:19
Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2014.10.016
Identification Number: doi:10.1016/j.jeurceramsoc.2014.10.016
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