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Core-Shell Lead-Free Piezoelectric Ceramics: Current Status and Advanced Characterization of the Bi1/2Na1/2TiO3-SrTiO3System

Acosta, Matias and Schmitt, Ljubomira A. and Molina-Luna, Leopoldo and Scherrer, Michael C. and Brilz, Michael and Webber, Kyle G. and Deluca, Marco and Kleebe, Hans-Joachim and Rödel, Jürgen and Donner, Wolfgang and Johnson, D. (2015):
Core-Shell Lead-Free Piezoelectric Ceramics: Current Status and Advanced Characterization of the Bi1/2Na1/2TiO3-SrTiO3System.
In: Journal of the American Ceramic Society, John Wiley & Sons, Inc., pp. 3405-3422, 98, (11), ISSN 00027820, [Online-Edition: http://dx.doi.org/10.1111/jace.13853],
[Article]

Abstract

The design of core-shell materials affords additional degrees of freedom to tailor functional properties as compared to solid solution counterparts. Although to date most of the work in core-shell materials has focused on dielectrics, piezoelectric core-shell ceramics may gain similar interest. Generalities of core-shell functional ceramics features are addressed in this work. A model system, Bi1/2Na1/2TiO3-SrTiO3, is introduced to discuss structure-property relationships. We demonstrate that this system features a core-shell microstructure for the composition corresponding to 25at.% Sr. The material is studied by means of macroscopic functional properties and insitu structural characterization techniques at different length scales, such as X-ray diffraction, transmission electron microscopy, and Raman spectroscopy. The evolution of the core-shell with field and temperature determines its functional properties. The high strain of the system, 0.3% at 4kV/mm, is due to an electric-field-induced phase transition of the core and shell. Upon field removal the core remains in a poled state, whereas the shell is characterized by a reversible transformation. The reversibility of the phase transition of shells and associated switching are key features in the observed giant strain. Dielectric anomalies are found to be related to changes in oxygen octahedral tilting angles within the core and shell.

Item Type: Article
Erschienen: 2015
Creators: Acosta, Matias and Schmitt, Ljubomira A. and Molina-Luna, Leopoldo and Scherrer, Michael C. and Brilz, Michael and Webber, Kyle G. and Deluca, Marco and Kleebe, Hans-Joachim and Rödel, Jürgen and Donner, Wolfgang and Johnson, D.
Title: Core-Shell Lead-Free Piezoelectric Ceramics: Current Status and Advanced Characterization of the Bi1/2Na1/2TiO3-SrTiO3System
Language: English
Abstract:

The design of core-shell materials affords additional degrees of freedom to tailor functional properties as compared to solid solution counterparts. Although to date most of the work in core-shell materials has focused on dielectrics, piezoelectric core-shell ceramics may gain similar interest. Generalities of core-shell functional ceramics features are addressed in this work. A model system, Bi1/2Na1/2TiO3-SrTiO3, is introduced to discuss structure-property relationships. We demonstrate that this system features a core-shell microstructure for the composition corresponding to 25at.% Sr. The material is studied by means of macroscopic functional properties and insitu structural characterization techniques at different length scales, such as X-ray diffraction, transmission electron microscopy, and Raman spectroscopy. The evolution of the core-shell with field and temperature determines its functional properties. The high strain of the system, 0.3% at 4kV/mm, is due to an electric-field-induced phase transition of the core and shell. Upon field removal the core remains in a poled state, whereas the shell is characterized by a reversible transformation. The reversibility of the phase transition of shells and associated switching are key features in the observed giant strain. Dielectric anomalies are found to be related to changes in oxygen octahedral tilting angles within the core and shell.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 98
Number: 11
Publisher: John Wiley & Sons, Inc.
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Elektromechanik von Oxiden
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science > Structure Research
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 19 Jan 2016 11:55
Official URL: http://dx.doi.org/10.1111/jace.13853
Identification Number: doi:10.1111/jace.13853
Funders: This work was financially supported by the Deutsche Forschungsgemeinschaft (DFG) under SFB595 and the State Center AdRIA on Adaptronics., K.G.W. acknowledges the DFG under WE4972/2-1 for financial support., The TEM microscopes were partially financed by the DFG.
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