Abstract
Lead-free (Ba0.85Ca0.15) (Ti0.90Zr0.10)O3 (15/10 BCZT) piezoelectric ceramics were prepared by a standard solid solution and sintered at different temperature of 1300 °C and 1500 °C at a time. The 15/10BCZT piezoceramics were prepared at 1300 °C sintering temperature by doping different amount of MnO2.The ceramics show a phase transition from a freoelectric tetragonal phase to a rhombohedral and tetragonal ferroelctric phase and to a single rhombohedral phase with increasing MnO2 content. The addition of MnO2 significantly improves the sinterbility of the 15/10BCZT piezoceramics, and reducing the sintering temperature from 1500 °C to 1300 °C by 200 °C but showing comparable piezoelectric properties. With 0.4 mol% of the dopant, ∼96.5% of the theoretical density of the ceramics was achieved with excellent piezoelectric coefficient d33 ~ 534pC/N, which is nearly equal to the value obtained from the ceramics sintered at 1500 °C which has a piezoelectric coefficient d33 ~ 570pC/N, high density (~ 5.59 g/cm3), maximum remnant polarization (Pr = 24 μC/cm2), relatively large grain size (10.4 μm) and the least coercieve field (Ec = 0.42 kV/mm). However, a high concentration of MnO2 deterioated the properties of the ceramics because of increasing of oxygen vacancies and associated defects. The results indicate that the BCTZ-y mol% MnO2 ceramics are one of the promising lead-free piezoelectric candidates for high temperature applications.
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Acknowledgments
Mulualem Abebe acknowledges the Department of Materials Science and Engineering, Indian Institute of Science for financial assistance to the research. Mesfin Zewdu and Mulualem Abebe gratefully acknowledges the Department of Materials Science and Engineering, Jimma Institute of Technology for publication.
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Mekonnen, M.A., Tadesse, M.Z. Low temperature sintering of (Ba0.85Ca0.15) (Ti0.90Zr0.10)O3 lead-free piezoceramic with the additive of MnO2. J Electroceram 46, 115–123 (2021). https://doi.org/10.1007/s10832-021-00250-x
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DOI: https://doi.org/10.1007/s10832-021-00250-x