Articles
  • Piezoelectric and dielectric properties of lead-free (Na0.44K0.52)Nb0.84O3-Li0.04(Sb0.06Ta0.1)O3 ceramics with a CuO content
  • Seung-Hwan Leea, Sung-Pill Namb, Sang-Chul Leea, Sung-Gap Leec and Young-Hie Leea,*
  • a Dept. of Electronics Materials Engineering, Kwangwoon University, 447-1 Wolgyedong, Nowongu, Seoul 139-701, Korea b Dept. of Smart Grid Research, Korea Electrotechnology Research Institute, Korea c Dept. of Ceramic Engineering, Eng. Res. Insti., Gyeongsang National University, Korea
Abstract
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.

Keywords: Lead-free, NKN-LST, CuO, Piezoelectric constant, Dielectric const

This Article

  • 2011; 12(2): 195-198

    Published on Apr 30, 2011