Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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MnO2 as an Effective Sintering Aid for Enhancing Piezoelectric Properties of (K,Na)NbO3 Ceramics

  • Jeong, Seong-Kyu (School of Materials Science and Engineering, University of Ulsan) ;
  • Hong, In-Ki (School of Materials Science and Engineering, University of Ulsan) ;
  • Do, Nam-Binh (School of Materials Science and Engineering, University of Ulsan) ;
  • Tran, Vu Diem Ngoc (School of Materials Science and Engineering, University of Ulsan) ;
  • Cho, Seong-Youl (R&D Center, LHE Corp.) ;
  • Taib, Weon Pil (Ulsan Fine Chemical Industry Center, Ulsan Technopark) ;
  • Lee, Jae-Shin (School of Materials Science and Engineering, University of Ulsan)
  • Received : 2010.09.03
  • Accepted : 2010.10.01
  • Published : 2010.10.28
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Abstract

The effects of $MnO_2$ doping on the crystal structure, ferroelectric, and piezoelectric properties of (K,Na)$NbO_3$ (KNN) ceramics have been investigated. $MnO_2$ was found to be effective in enhancing the densification and grain growth during sintering. X-ray diffraction analysis indicated that Mn ions substituted B-site Nb ions up to 2 mol%, however, further doping induced unwanted secondary phases. In comparison with undoped KNN ceramics, the well developed microstructure and the substitution to B-sites in 2 mol% Mn-doped KNN ceramics resulted in significant improvements in both piezoelectric coupling coefficient and electromechanical quality factor.

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