Koruza, Jurij ; Rojas, Virginia ; Molina-Luna, Leopoldo ; Kunz, Ulrike ; Dürrschnabel, Michael ; Kleebe, Hans-Joachim ; Acosta, Matias (2016)
Formation of the core-shell microstructure in lead-free Bi1/2Na1/2TiO3-SrTiO3 piezoceramics and its influence on the electromechanical properties.
In: Journal of the European Ceramic Society, 36 (4)
doi: 10.1016/j.jeurceramsoc.2015.11.046
Article, Bibliographie
Abstract
The Bi1/2Na1/2TiO3-based materials exhibit the largest electric-field-induced strains among lead-free piezoceramics and are considered as promising candidates for actuation applications. A typical representative of this group is (1-x)Bi1/2Na1/2TiO3-xSrTiO3, where its excellent electromechanical properties were recently related to the existence of a core–shell microstructure. Although the latter was also reported in other Bi1/2Na1/2TiO3-based ceramics, the formation mechanism remains unknown. In the present work we therefore first investigated the solid-state reaction occurring during calcination using simultaneous thermogravimetric analysis, X-ray diffraction, scanning and transmission electron microscopy. The reaction occurred in two steps, whereby the cores and shells had different formation reaction temperatures, which resulted in a metastable heterogeneous microstructure. Furthermore, a series of sintered samples with different relative densities, grain sizes, and core densities was prepared. Modifications of these microstructural parameters resulted in variation of the maximal strain by 17% and in the electric-field required to trigger the phase transitions by 38%.
| Item Type: | Article |
|---|---|
| Erschienen: | 2016 |
| Creators: | Koruza, Jurij ; Rojas, Virginia ; Molina-Luna, Leopoldo ; Kunz, Ulrike ; Dürrschnabel, Michael ; Kleebe, Hans-Joachim ; Acosta, Matias |
| Type of entry: | Bibliographie |
| Title: | Formation of the core-shell microstructure in lead-free Bi1/2Na1/2TiO3-SrTiO3 piezoceramics and its influence on the electromechanical properties |
| Language: | English |
| Date: | March 2016 |
| Publisher: | Elsevier Science Ltd. |
| Journal or Publication Title: | Journal of the European Ceramic Society |
| Volume of the journal: | 36 |
| Issue Number: | 4 |
| DOI: | 10.1016/j.jeurceramsoc.2015.11.046 |
| URL / URN: | https://www.sciencedirect.com/science/article/pii/S095522191... |
| Abstract: | The Bi1/2Na1/2TiO3-based materials exhibit the largest electric-field-induced strains among lead-free piezoceramics and are considered as promising candidates for actuation applications. A typical representative of this group is (1-x)Bi1/2Na1/2TiO3-xSrTiO3, where its excellent electromechanical properties were recently related to the existence of a core–shell microstructure. Although the latter was also reported in other Bi1/2Na1/2TiO3-based ceramics, the formation mechanism remains unknown. In the present work we therefore first investigated the solid-state reaction occurring during calcination using simultaneous thermogravimetric analysis, X-ray diffraction, scanning and transmission electron microscopy. The reaction occurred in two steps, whereby the cores and shells had different formation reaction temperatures, which resulted in a metastable heterogeneous microstructure. Furthermore, a series of sintered samples with different relative densities, grain sizes, and core densities was prepared. Modifications of these microstructural parameters resulted in variation of the maximal strain by 17% and in the electric-field required to trigger the phase transitions by 38%. |
| Uncontrolled Keywords: | Piezoelectricity, Lead-free, Core-shell, Electromechanical properties, Relaxor |
| Divisions: | 11 Department of Materials and Earth Sciences 11 Department of Materials and Earth Sciences > Earth Science 11 Department of Materials and Earth Sciences > Earth Science > Geo-Material-Science 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Advanced Electron Microscopy (aem) 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials 11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy |
| Date Deposited: | 10 Dec 2018 09:54 |
| Last Modified: | 15 Sep 2021 08:09 |
| PPN: | |
| Funders: | This work was supported by the AdRIA Hesse state center for Adaptronics, the German Research Foundation (DFG) Sonderforschungsbereich 595, and Leibniz program under RO954/22-1., The transmission electron microscopes employed for this work were partially funded by the German Research Foundation (DFG/INST163/2951)., Dipl.-Ing. Claudia Fasel is acknowledged for her involvement in the STA-IR measurements. |
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