Chemical and structural effects on the high-temperature mechanical behavior of (1-x)(Na1/2Bi1/2)TiO3-xBaTiO(3) ceramics
Deluca M, Picht G, Hoffmann MJ, Rechtenbach A, Toepfer J, Schader FH, Webber KG (2015)
Publication Status: Published
Publication Type: Journal article
Publication year: 2015
Journal
Publisher: American Institute of Physics (AIP)
Book Volume: 117
DOI: 10.1063/1.4916784
Abstract
Bismuth sodium titanatebarium titanate [(1-x)(Na1/2Bi1/2)TiO3-xBaTiO3, NBT-100xBT] is one of the most well studied lead-free piezoelectric materials due in large part to the high field-induced strain attainable in compositions near the morphotropic phase boundary (x = 0.06). The BaTiO3-rich side of the phase diagram, however, has not yet been as comprehensively studied, although it might be important for piezoelectric and positive temperature coefficient ceramic applications. In this work, we present a thorough study of BaTiO3-rich NBT-100xBT by ferroelastic measurements, dielectric permittivity, X-ray diffraction, and Raman spectroscopy. We show that the high-temperature mechanical behavior, i.e., above the Curie temperature, TC, is influenced by local disorder, which appears also in pure BT. On the other hand, in NBT-100xBT (x<1.0), lattice distortion, i.e., tetragonality, increases, and this impacts both the mechanical and dielectric properties. This increase in lattice distortion upon chemical substitution is counterintuitive by merely reasoning on the ionic size, and is due to the change in the A-O bond character induced by the Bi3+ electron lone pair, as indicated by Raman spectroscopy. (C) 2015 AIP Publishing LLC.
Authors with CRIS profile
Involved external institutions
Materials Center Leoben GmbH
Austria (AT)
Karlsruhe Institute of Technology (KIT)
Germany (DE)
Ernst-Abbe-Hochschule Jena / University of Applied Sciences
Germany (DE)
Technische Universität Darmstadt
Germany (DE)
Austria (AT)
Karlsruhe Institute of Technology (KIT)
Germany (DE)
Ernst-Abbe-Hochschule Jena / University of Applied Sciences
Germany (DE)
Technische Universität Darmstadt
Germany (DE)
How to cite
APA:
Deluca, M., Picht, G., Hoffmann, M.J., Rechtenbach, A., Toepfer, J., Schader, F.H., & Webber, K.G. (2015). Chemical and structural effects on the high-temperature mechanical behavior of (1-x)(Na1/2Bi1/2)TiO3-xBaTiO(3) ceramics. Journal of Applied Physics, 117. https://doi.org/10.1063/1.4916784
MLA:
Deluca, Marco, et al. "Chemical and structural effects on the high-temperature mechanical behavior of (1-x)(Na1/2Bi1/2)TiO3-xBaTiO(3) ceramics." Journal of Applied Physics 117 (2015).
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