Core–Shell Lead–Free Piezoelectric Ceramics: Current Status and Advanced Characterization of the Bi1/2Na1/2TiO3–SrTiO3 System

Journal article


Publication Details

Author(s): Acosta M, Schmitt LA, Molina-Luna L, Scherrer MC, Brilz M, Webber K, Deluca M, Kleebe HJ, Rödel J, Donner W
Journal: Journal of the American Ceramic Society
Publication year: 2015
Volume: 98
Journal issue: 11
Pages range: 3405-3422
ISSN: 1551-2916
Language: English


Abstract





The design of coreshell materials affords additional degrees of freedom to tailor functional properties as compared to solid solution counterparts. Although to date most of the work in coreshell materials has focused on dielectrics, piezoelectric coreshell ceramics may gain similar interest. Generalities of coreshell functional ceramics features are addressed in this work. A model system, Bi1/2Na1/2TiO3SrTiO3, is introduced to discuss struc- tureproperty relationships. We demonstrate that this system fea- tures a coreshell microstructure for the composition corresponding to 25 at.% Sr. The material is studied by means of macroscopic functional properties and in situ structural character- ization techniques at different length scales, such as X-ray diffrac- tion, transmission electron microscopy, and Raman spectroscopy. The evolution of the coreshell with field and temperature deter- mines its functional properties. The high strain of the system, ~0.3% at 4 kV/mm, is due to an electric-field-induced phase tran- sition 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.






 



FAU Authors / FAU Editors

Webber, Kyle Prof.
Professur für Werkstoffwissenschaften (Funktionskeramik)


How to cite

APA:
Acosta, M., Schmitt, L.A., Molina-Luna, L., Scherrer, M.C., Brilz, M., Webber, K.,... Donner, W. (2015). Core–Shell Lead–Free Piezoelectric Ceramics: Current Status and Advanced Characterization of the Bi1/2Na1/2TiO3–SrTiO3 System. Journal of the American Ceramic Society, 98(11), 3405-3422. https://dx.doi.org/10.1111/jace.13853

MLA:
Acosta, Matias, et al. "Core–Shell Lead–Free Piezoelectric Ceramics: Current Status and Advanced Characterization of the Bi1/2Na1/2TiO3–SrTiO3 System." Journal of the American Ceramic Society 98.11 (2015): 3405-3422.

BibTeX: 

Last updated on 2018-18-06 at 11:23