화학공학소재연구정보센터
Journal of the American Ceramic Society, Vol.95, No.12, 3889-3893, 2012
Dielectric, Ferroelectric, and Piezoelectric Properties of Bi(Ni1/2Ti1/2)O3-Modified BiFeO3-BaTiO3 Ceramics with High Curie Temperature
New piezoelectric ceramics, 0.71BiFe1-x(Ni1/2Ti1/2)x O3-0.29BaTiO3+0.6 wt% MnO2 [BFNTxBT] (x = 00.09), were fabricated using conventional mixed-oxide method. It was found that the introduction of BNT into BF-BT system caused insignificant change in crystal structure, which is a single-phase perovskite structure. However, an obvious variation in microstructure took place. The ceramics with composition of x = 0.03 showed enhanced piezoelectric, electromechanical, and ferroelectric properties with piezoelectric constant d33 = 156 pC/N, planar electromechanical coupling factors kp = 0.308, remnant polarization Pr = 22.5 mu C/cm2, and coercive field Ec = 28.2 kV/cm, with a high Curie temperature Tc = 431 degrees C, respectively. The combination of good piezoelectric properties and high Tc makes these ceramics suitable for elevated temperature piezoelectric devices.