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이승환,Sung-Pill Nam,Sang-Chul Lee,이성갑,이영희 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.2
Lead-free NKN-LST ceramics with a content of CuO were fabricated by a conventional mixed oxide method. The results indicate that the content of CuO significantly influences the sintering, microstructure, phase transition and electrical properties of NKN-LST ceramics. For the NKN-LST-xCuO ceramics sintered at 1050oC, the bulk density increased with the content of CuO and showed a maximum value at a content of 2.0 mol% CuO. The Curie temperature of the NKN-LST-xCuO ceramics slightly decreased towards a lower temperature with increasing CuO content. The dielectric constant, piezoelectric constant and electromechanical coupling factor increased with a small amount of CuO content, which might be due to the increase in density. A high d33 = 153 pC/N, kp = 35% and ε = 925 were obtained for the NKN-LST-0.5CuO ceramics sintered at 1050 oC for 2 h.
이승환,남성필,이성갑,이영희,Lee, Seung-Hwan,Nam, Sung-Pill,Lee, Sung-Gap,Lee, Young-Hie 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.2
The 0.98 ($Na_{0.44}K_{0.52})Nb_{0.84}O_3-0.02Li_{0.04}$ ($Sb_{0.06}Ta_{0.1})O_3-0.5$ mol%CuO ceramics have been fabircated by ordinary sintering technique and the effect of various calcination method on the electrical propertis and microstructure have been studied. It was observed that the various calcination method influenced the elelctrical properties and structural properties of the 0.98NKN-0.02LST-0.5 mol%CuO ceramics with the optimum piezoelectric constant ($d_{33}$) and electromechanical coupling factor ($k_p$) at room temperature of about $155{\rho}C/N$ and 0.349, respectively, from 0.98NKN-0.02LST-0.5 mol%CuO ceramics sample. The curie temperature ($T_c$) of this ceramic was found at $440^{\circ}C$. The 0.98NKN-0.02LST-0.5 mol%CuO ceramics are a promising lead-free piezoelectric ceramics.