Abstract
Lead-free MnO2-doped K0.5Na0.5Nb0.92Sb0.08O3 ceramics have been fabricated by a conventional ceramic technique and their dielectric and piezoelectric properties have been studied. Our results show that a small amount of MnO2 (0.5–1.0 mol%) is enough to improve the densification of the ceramics and decrease the sintering temperature of the ceramics. The co-effects of MnO2 doping and Sb-substitution lead to significant improvements in the ferroelectric and piezoelectric properties. The K0.5Na0.5Nb0.92Sb0.08O3 ceramic with 0.5 mol%MnO2 doping possesses optimum propeties: d 33 = 187 pC/N, k P = 47.2%, ε r = 980, tanδ = 2.71% and T c = 287 °C. Due to high tetragonal-orthorhombic phase transition temperature (T O-T ~ 150 °C), the K0.5Na0.5Nb0.92Sb0.08O3 ceramic with 0.5 mol%MnO2 doping exhibits a good thermal stability of piezoelectric properties.
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Acknowledgment
This work was supported by the project of Education Department of Sichuan Province (08ZA047), and Science and Technology Bureau of Sichuan Province (09ZQ026-059)
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Lin, D., Zheng, Q., Kwok, K.W. et al. Dielectric and piezoelectric properties of MnO2-doped K0.5Na0.5Nb0.92Sb0.08O3 lead-free ceramics. J Mater Sci: Mater Electron 21, 649–655 (2010). https://doi.org/10.1007/s10854-009-9971-7
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DOI: https://doi.org/10.1007/s10854-009-9971-7