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- MnO2 as an Effective Sintering Aid for Enhancing Piezoelectric Properties of (K,Na)NbO3 Ceramics
- Seong-Kyu Jeong, In-Ki Hong, Nam-Binh Do, Vu Diem Ngoc Tran, Seong-Youl Cho, Weon Pil Taib, Jae-Shin Lee
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Journal of Korean Powder Metallurgy Institute 2010;17(5):399-403
DOI: https://doi.org/10.4150/KPMI.2010.17.5.399
1School of Materials Science and Engineering, University of Ulsan
2School of Materials Science and Engineering, University of Ulsan
3School of Materials Science and Engineering, University of Ulsan
4School of Materials Science and Engineering, University of Ulsan
5R&D Center, LHE Corp.
6Ulsan Fine Chemical Industry Center, Ulsan Technopark
7School of Materials Science and Engineering, University of Ulsan
2School of Materials Science and Engineering, University of Ulsan
3School of Materials Science and Engineering, University of Ulsan
4School of Materials Science and Engineering, University of Ulsan
5R&D Center, LHE Corp.
6Ulsan Fine Chemical Industry Center, Ulsan Technopark
7School of Materials Science and Engineering, University of Ulsan
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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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