Piezoelectric Properties of lead free (Na0.44K0.52)Nb0.84O3-Li0.04(Sb0.06Ta0.1)O3 Ceramics with ZnO Addition

Abstract - Electrical and structural properties were investigated on the effects of ZnO and the lead-free NKN-LST ceramics with the addition of ZnO were fabricated by a conventional mixed oxide method. A gradual change in the crystal and microstructure was observed with the increase of ZnO addition. For the NKN-LST-ZnO ceramics sintered at 1050℃, bulk density increased with the addition of ZnO and showed maximum value at addition 2.0mol% of ZnO. Curie temperature of the NKN-LST-ZnO ceramics slightly decreased with adding ZnO. The dielectric constant, piezoelectric constant (d 33 ) and electromechanical coupling factor (k p ) increased at the small amount of ZnO addition, which might be due to the increase in density. The high piezoelectric properties = 153 pC/N, electromechanical coupling factor = 0.484 and dielectric constant = 2883 were obtained for the NKN-LST+0.5ZnO ceramics sintered at 1050℃ for 2h. Key Words : Piezoelectric properties, Lead-free, ZnO addition, Dielectric properties*준 회 원 : 광운대 전자정보대 전자재료공학과 석사과정** 준 회 원 : 광운대 전자정보대 전자재료공학과 박사과정***정 회 원 : 경상대 공대 세라믹공학과 박사후 연구원† 교신저자, 펠로우회원 : 광운대 전자재료공학과 교수E-mail : yhlee@kw.ac.kr 접수일자 : 2010년 8월 24일 최종완료 : 2010년 9월 27일