| Title |
Structural and Electrical Properties of (Na0.5K0.5)NbO3 Ceramics with Addition of BiTiO3 |
| Authors |
이태호(Lee, Tae-Ho) ; 김대영(Kim, Dae-Young) ; 조서현(Jo, Seo-Hyeon) ; 정광호(Jeong, Gwang-Ho) ; 이성갑(Lee, Sung-Gap) |
| DOI |
https://doi.org/10.5370/KIEE.2011.60.11.2093 |
| Keywords |
Electrical properties ; NKN ; BTO ; Piezoelectric ; Dielectric constant |
| Abstract |
In this study, lead-free (Na_{0.5}K_{0.5})NbO_3-BiTiO_3 ceramics were fabricated by a conventional mixed oxide method. Structural and electrical properties of lead-free (Na_{0.5}K_{0.5})NbO_3 ceramics with the variation of BiTiO_3 were investigated. The results of X-ray diffraction analysis showed a typical polycrystalline perovskite structure without presence of the second phase in all specimens. Sintered density increased with an increasing of BTO and the specimen added with 0.07 mol% of BiTiO_3 showed the maximum value of 97.8%. Average grain size decreased and densification increased with an increasing of BiTiO_3 contents. The electromechanical coupling factor of the 0.01 mol% BiTiO_3 doped NKN specimens was 0.32. Dielectric constant, dielectric loss and Curie temperature of the 0.07 mol% BiTiO_3 doped NKN specimens were 1185, 0.145% and 400°C, respectively. |