Electromechanical Properties of the Lead-Free
V. Rojas1, J. Koruza1, M. Acosta1, D.R.J. Brandt1, K.G. Webber2, J. Rödel1
1 Technische Universität Darmstadt, Darmstadt, Germany.
2 Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany
The (1-x)Ba(Zr0.2Ti0.8)O3–x(Ba0.7Ca0.3)TiO3 piezoceramic is investigated as a possible alternative to lead containing piezoelectrics for actuator applications. Compositions with rhombohedral, orthorhombic, and tetragonal crystal structure were prepared and the large-signal piezoelectric response and blocking stress were evaluated at different electric fields. The rhombohedral and orthorhombic compositions showed the best properties with a blocking stress of -62 MPa at 2 kV/mm and a large signal d33* of 851 pm/V at 0.5 kV/mm, which exceeds the values reported for commercial soft-type PZT. The differences observed between different compositions were attributed to the changes in the strain mechanisms that occur due to the specific crystal
symmetries and their vicinity to the phase transition boundaries.
ACTUATOR 2016 Manuscript A1.1
Publication date: 01/06/2016
Manuscript A1.1 published in Conference Proceedings ACTUATOR 2016
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