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, 35, pp. 1209-1217. Elsevier, ISSN 09552219,
[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 |
| Journal 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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