| Title |
Electrical Properties of lead free (Na,K,Li)(Nb,Sb,Ta)O3 Ceramics with MnO2 Addition |
| Authors |
이승환(Lee, Seung-Hwan) ; 남성필(Nam, Sung-Pill) ; 이동현(Lee, Dong-Hyun) ; 이성갑(Lee, Sung-Gap) ; 이상철(Lee, Sang-Chul) ; 이영희(Lee, Young-Hie) |
| DOI |
https://doi.org/10.5370/KIEE.2011.60.4.801 |
| Keywords |
Piezoelectric properties ; Lead-free ; NKN-LST-MnO_2 ; Dielectric properties |
| Abstract |
Electrical properties and microstructure were investigated on the effects of MnO_2 and the lead-free (Na_{0.44}K_{0.52}Li_{0.04})(Nb_{0.83}Sb_{0.07}Ta_{0.1})O_3 ceramics with the addition of MnO_2 were fabricated by a conventional mixed oxide method. A gradual change in the crystal and microstructure was observed with the increase of MnO_2 addition. For the NKN-LST-xmol%MnO_2 sintered at 1100°C, bulk density increased with the addition of MnO_2 and showed maximum value at addition 1.0mol% of MnO_2. Curie temperature of the NKN-LST ceramics slightly decreased with adding MnO_2. The dielectric constant, piezoelectric constant (d_{33}) and electromechanical coupling factor (k_p) increased below 0.25mol% of MnO_2 addition, which might be due to the increase in density. The high piezoelectric properties = 145 pC/N, electromechanical coupling factor = 0.421 and dielectric constant = 2883 were obtained for the NKN-LST-0.25mol%MnO_2 sintered at 1100°C for 4h. |