Effect of alumina or zirconia particles on the performance of lead-free BCZT piezoceramics
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Date
2024-12-15
Authors
Mařák, Vojtěch
Drdlík, Daniel
Bijalwan, Vijay
Tofel, Pavel
Erhart, Jiří
Chlup, Zdeněk
Maca, Karel
0000-0001-6594-5214Advisor
Referee
Mark
Journal Title
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Volume Title
Publisher
Elsevier
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Abstract
The barium titanate derivative Ba0.85Ca0.15Zr0.1Ti0.9O3 (BCZT) offers high dielectric and piezoelectric performance but has poor mechanical properties. Ceramic composite materials combining BCZT with tougher Al2O3 or ZrO2 could be the solution to the inherent brittleness of electroceramics. This work focuses on BCZT with 1–5 vol% addition of reinforcing phase dispersed in the microstructure. While hardness was improved in all composites, especially in ZrO2-reinforced BCZT, toughness was positively affected only by Al2O3. The chemical reactivity of BCZT during sintering resulted in the formation of new barium aluminate phases at the grain boundaries and possibly also within the grains, which affected the electrical properties of the composites. The addition of zirconia resulted in the formation of BaZrO3 or Ba(Zr,Ti)O3, which is a natural part of the BCZT solid solution and shifts the phase composition towards relaxor behaviour. ZrO2-reinforced composites exhibited higher permittivity but lower ferroelectric properties, accompanied by a substantial Curie temperature decrease.
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Citation
CERAMICS INTERNATIONAL. 2024, vol. 50, issue 24, p. 53491-53501.
https://www.sciencedirect.com/science/article/pii/S0272884224047187
https://www.sciencedirect.com/science/article/pii/S0272884224047187
Document type
Peer-reviewed
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en