Journal of Materials Science: Materials in Electronics

, Volume 21, Issue 7, pp 649–655

Dielectric and piezoelectric properties of MnO2-doped K0.5Na0.5Nb0.92Sb0.08O3 lead-free ceramics

Authors

    • College of Chemistry and Materials Science, and Visual Computing and Virtual Reality Key Laboratory of Sichuan ProvinceSichuan Normal University
  • Qiaoji Zheng
    • College of Chemistry and Materials Science, and Visual Computing and Virtual Reality Key Laboratory of Sichuan ProvinceSichuan Normal University
  • K. W. Kwok
    • Department of Applied Physics and Materials Research CentreThe Hong Kong Polytechnic University
  • Chenggang Xu
    • College of Chemistry and Materials Science, and Visual Computing and Virtual Reality Key Laboratory of Sichuan ProvinceSichuan Normal University
  • Chun Yang
    • College of Chemistry and Materials Science, and Visual Computing and Virtual Reality Key Laboratory of Sichuan ProvinceSichuan Normal University
Article

DOI: 10.1007/s10854-009-9971-7

Cite this article as:
Lin, D., Zheng, Q., Kwok, K.W. et al. J Mater Sci: Mater Electron (2010) 21: 649. doi:10.1007/s10854-009-9971-7

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: d33 = 187 pC/N, kP = 47.2%, εr = 980, tanδ = 2.71% and Tc = 287 °C. Due to high tetragonal-orthorhombic phase transition temperature (TO-T ~ 150 °C), the K0.5Na0.5Nb0.92Sb0.08O3 ceramic with 0.5 mol%MnO2 doping exhibits a good thermal stability of piezoelectric properties.

Copyright information

© Springer Science+Business Media, LLC 2009