| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
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| Symposium
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Advances in Dielectric Materials and Electronic Devices
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| Presentation Title |
Structure and Domain Morphology of Quenched Na1/2Bi1/2TiO3-BaTiO3 Piezoceramics
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| Author(s) |
Andreas Wohninsland, Ann-Katrin Fetzer, Hans-Joachim Kleebe, Lalitha Kodumudi Venkataraman |
| On-Site Speaker (Planned) |
Lalitha Kodumudi Venkataraman |
| Abstract Scope |
Quenching lead-free perovskite-structured (Na1/2Bi1/2)TiO3-based compositions from the sintering temperature is beneficial in widening the operational temperature range of these materials in application. The thermal stresses that develop upon quenching are insignificant to result in fracture, thus establishing practical relevance of this processing strategy1. In this talk, the results of high resolution diffraction and domain-scale imaging (using TEM) will be presented and a correlation is established with the dielectric properties. The morphotropic phase boundary composition (Na1/2Bi1/2)TiO3-6 mole% BaTiO3 with average cubic and rhombohedral distortions transforms to a mixture of rhombohedral and tetragonal phases, upon quenching2. Quenching refines the phase assemblage and promotes a lamellar domain contrast, which directly correlates to the enhanced ferroelectric stability that increases the thermal depolarization temperature2. Current understanding of the mechanisms related to quenching bismuth-based piezoceramics will be outlined.
1M-H. Zhang et al., Appl. Phys. Lett. 2020; 116(26):262902
2A-K. Fetzer et al., Open Ceramics. 2021;100077 |