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http://dx.doi.org/10.4150/KPMI.2010.17.5.399

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)
Publication Information
Journal of Powder Materials / v.17, no.5, 2010 , pp. 399-403 More about this Journal
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.
Keywords
Lead-free piezoelectric ceramics; Bismuth sodium potassium titanate; Mn doping; Electric-fieldinduced strain;
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