Author/Authors :
Sang-Ho Moon، نويسنده , , Yong-Su Ham، نويسنده , , Seok-Woo Yun، نويسنده , , Kyoung Soo Lee، نويسنده , , Sang-Mo Koo، نويسنده , , Jae-Geun Ha، نويسنده , , Soon-Jong Jeong، نويسنده , , Min-Soo Kim، نويسنده , , Jung-Hyuk Koh، نويسنده ,
Abstract :
1 mol% Li2O excess (Na0.51K0.47Li0.02)(Nb0.8Ta0.2)O3 ceramics were prepared by the conventional mixed oxide method and sintered from 950 to 1200 °C. Also, Li2O was employed as a sintering aid for high densification and low temperature sintering process. X-ray diffraction results of 1 mol% Li2O excess (Na0.51K0.47Li0.02)(Nb0.8Ta0.2)O3 lead free piezoelectric ceramics indicated that the specimens were well crystallized and have tetragonal structure. The specimens which sintered at 1050 °C showed the highest piezoelectric properties compared with others. The measured piezoelectric constant and electromechanical coupling coefficient were 231 pC/N and 38.9%, respectively. Curie temperature of (Na0.51K0.47Li0.02)(Nb0.8Ta0.2)O3 ceramics was 344.32, 344.4 and 344.5 °C at 1, 10 and 100 kHz, respectively.
Keywords :
C. Piezoelectric properties , D. Perovskites , A. Sintering , NKN–LT
