TY - JOUR
T1 - Polymorphic phase transition dependence of piezoelectric properties in (K0.5Na0.5)NbO3-(Bi0.5K 0.5)TiO3 lead-free ceramics
AU - Du, Hongliang
AU - Zhou, Wancheng
AU - Luo, Fa
AU - Zhu, Dongmei
AU - Qu, Shaobo
AU - Li, Ye
AU - Pei, Zhibin
PY - 2008/6/7
Y1 - 2008/6/7
N2 - Lead-free ceramics (1 - x)(K0.5Na0.5)NbO 3-x(Bi0.5K0.5)TiO3 [(1 - x)KNN-xBKT] were synthesized by conventional solid-state sintering. The phase structure, microstructure and electrical properties of (1 - x)KNN-xBKT ceramics were investigated. At room temperature, the polymorphic phase transition (from the orthorhombic to the tetragonal phase) (PPT) was identified at x = 0.02 by the analysis of x-ray diffraction patterns and dielectric spectroscopy. Enhanced electrical properties (d33 = 251 pC N-1, kp = 0.49, kt = 0.50, , tan δ = 0.03 and TC = 376 °C) were obtained in the ceramics with x = 0.02 owing to the formation of the PPT at 70 °C and the selection of an optimum poling temperature. The related mechanisms for high piezoelectric properties in (1 - x)KNN-xBKT (x = 0.02) ceramics were discussed. In addition, the results confirmed that the selection of the optimum poling temperature was an effective way to further improve the piezoelectric properties of KNN-based ceramics. The enhanced properties were comparable to those of hard Pb(Zr, Ti)O3 ceramics and indicated that the (1 - x)KNN-xBKT (x = 0.02) ceramic was a promising lead-free piezoelectric candidate material for actuator and transducer applications.
AB - Lead-free ceramics (1 - x)(K0.5Na0.5)NbO 3-x(Bi0.5K0.5)TiO3 [(1 - x)KNN-xBKT] were synthesized by conventional solid-state sintering. The phase structure, microstructure and electrical properties of (1 - x)KNN-xBKT ceramics were investigated. At room temperature, the polymorphic phase transition (from the orthorhombic to the tetragonal phase) (PPT) was identified at x = 0.02 by the analysis of x-ray diffraction patterns and dielectric spectroscopy. Enhanced electrical properties (d33 = 251 pC N-1, kp = 0.49, kt = 0.50, , tan δ = 0.03 and TC = 376 °C) were obtained in the ceramics with x = 0.02 owing to the formation of the PPT at 70 °C and the selection of an optimum poling temperature. The related mechanisms for high piezoelectric properties in (1 - x)KNN-xBKT (x = 0.02) ceramics were discussed. In addition, the results confirmed that the selection of the optimum poling temperature was an effective way to further improve the piezoelectric properties of KNN-based ceramics. The enhanced properties were comparable to those of hard Pb(Zr, Ti)O3 ceramics and indicated that the (1 - x)KNN-xBKT (x = 0.02) ceramic was a promising lead-free piezoelectric candidate material for actuator and transducer applications.
UR - http://www.scopus.com/inward/record.url?scp=44449092983&partnerID=8YFLogxK
U2 - 10.1088/0022-3727/41/11/115413
DO - 10.1088/0022-3727/41/11/115413
M3 - 文章
AN - SCOPUS:44449092983
SN - 0022-3727
VL - 41
JO - Journal of Physics D: Applied Physics
JF - Journal of Physics D: Applied Physics
IS - 11
M1 - 115413
ER -