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
Artikel, Bibliographie
Kurzbeschreibung (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%.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2016 |
| Autor(en): | Koruza, Jurij ; Rojas, Virginia ; Molina-Luna, Leopoldo ; Kunz, Ulrike ; Dürrschnabel, Michael ; Kleebe, Hans-Joachim ; Acosta, Matias |
| Art des Eintrags: | Bibliographie |
| Titel: | Formation of the core-shell microstructure in lead-free Bi1/2Na1/2TiO3-SrTiO3 piezoceramics and its influence on the electromechanical properties |
| Sprache: | Englisch |
| Publikationsjahr: | März 2016 |
| Verlag: | Elsevier Science Ltd. |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the European Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 36 |
| (Heft-)Nummer: | 4 |
| DOI: | 10.1016/j.jeurceramsoc.2015.11.046 |
| URL / URN: | https://www.sciencedirect.com/science/article/pii/S095522191... |
| Kurzbeschreibung (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%. |
| Freie Schlagworte: | Piezoelectricity, Lead-free, Core-shell, Electromechanical properties, Relaxor |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften > Fachgebiet Geomaterialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Elektronenmikroskopie 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Nichtmetallisch-Anorganische Werkstoffe 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Physikalische Metallkunde |
| Hinterlegungsdatum: | 10 Dez 2018 09:54 |
| Letzte Änderung: | 15 Sep 2021 08:09 |
| PPN: | |
| Sponsoren: | 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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