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

  • Dunmin Lin
  • Qiaoji Zheng
  • K. W. Kwok
  • Chenggang Xu
  • Chun Yang
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
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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

Authors and Affiliations

  • Dunmin Lin
    • 1
  • Qiaoji Zheng
    • 1
  • K. W. Kwok
    • 2
  • Chenggang Xu
    • 1
  • Chun Yang
    • 1
  1. 1.College of Chemistry and Materials Science, and Visual Computing and Virtual Reality Key Laboratory of Sichuan ProvinceSichuan Normal UniversityChengduPeople’s Republic of China
  2. 2.Department of Applied Physics and Materials Research CentreThe Hong Kong Polytechnic UniversityKowloon, Hong KongChina