TY - GEN
T1 - Microstructure and Piezoelectric Properties of [(K0.5Na 0.5)1-xLix](Nb1-yTa y)O3 Lead-free Piezoelectric Ceramics
AU - Xu, Bei
AU - Gao, Feng
AU - Li, Bo
AU - Liu, Liangliang
AU - Deng, Zhenqi
PY - 2011
Y1 - 2011
N2 - Li+ and Ta5+ modified lead-free piezoelectric ceramics [(K0.5Na0.5)1-xLix](Nb 1-yTay)O3 have been prepared by an ordinary sintering technique. Effect of Li+ and Ta5+ on microstructure and piezoelectric properties of the ceramics was systematically studied. A morphotropic phase boundary between orthorhombic and tetragonal phases is identified in the composition range of (0.02≤x≤0.04, 0.15≤y≤0.25), which can enhance electrical properties of [(K0.5Na0.5)1-xLi x](Nb1-yTay)O3 ceramics. The Curie temperature TC of these ceramics is lower than that of pure (K 0.5Na0.5)NbO3 ceramics, but the temperature of orthorhombic to tetragonal phase transition TO-T of the former is higher than that of the latter. TC and TO-T both decrease as the content of Ta5+ increases. With the addition of Li+ increasing, TC increases. The optimal piezoelectric properties are obtained at (x, y)=(0.03, 0.20): piezoelectric constant d33 is 192pC/N; the electromechanical coefficient of the planar mode kp is 44%; room temperature dielectric constant εr is 1049, and the corresponding mechanical quality factor Qm is 49.
AB - Li+ and Ta5+ modified lead-free piezoelectric ceramics [(K0.5Na0.5)1-xLix](Nb 1-yTay)O3 have been prepared by an ordinary sintering technique. Effect of Li+ and Ta5+ on microstructure and piezoelectric properties of the ceramics was systematically studied. A morphotropic phase boundary between orthorhombic and tetragonal phases is identified in the composition range of (0.02≤x≤0.04, 0.15≤y≤0.25), which can enhance electrical properties of [(K0.5Na0.5)1-xLi x](Nb1-yTay)O3 ceramics. The Curie temperature TC of these ceramics is lower than that of pure (K 0.5Na0.5)NbO3 ceramics, but the temperature of orthorhombic to tetragonal phase transition TO-T of the former is higher than that of the latter. TC and TO-T both decrease as the content of Ta5+ increases. With the addition of Li+ increasing, TC increases. The optimal piezoelectric properties are obtained at (x, y)=(0.03, 0.20): piezoelectric constant d33 is 192pC/N; the electromechanical coefficient of the planar mode kp is 44%; room temperature dielectric constant εr is 1049, and the corresponding mechanical quality factor Qm is 49.
KW - Lead-free ceramics
KW - Microstructure
KW - Morphotropic phase boundary
KW - Piezoelectric properties
UR - https://www.scopus.com/pages/publications/78650820855
U2 - 10.4028/www.scientific.net/AMR.156-157.1522
DO - 10.4028/www.scientific.net/AMR.156-157.1522
M3 - 会议稿件
AN - SCOPUS:78650820855
SN - 9780878492053
T3 - Advanced Materials Research
SP - 1522
EP - 1527
BT - Advanced Manufacturing Technology
T2 - 2010 International Conference on Advances in Materials and Manufacturing Processes, ICAMMP 2010
Y2 - 6 November 2010 through 8 November 2010
ER -