BiScO3-xPbTiO3-yPb(Yb1/2Nb1/2)O3压电陶瓷的性能

摘要

BiScO3-xPbTiO3-yPb(Yb1/2Nb1/2)O3 (BS-xPT-yPYN,y=0.10,0.15,0.20, 0.30) piezoelectric ceramics were prepared by the precursor method.The effects of PYN molar fraction y on the microstructure, phase composition, phase structure, ferroelectric and piezoelectric properties of BS-xPT-yPYN ceramics were investigated.The results indicate that when y increased, the grain size of piezoelectric ceramics increased, the transformation from rhombohedral phase to tetragonal phase took place and the piezoelectric properties declined.When the molar fraction of PYN was 0.10, the higher coercive electric field Ec, the more obvious increase residual polarization Pr of piezoelectric ceramics had.%用前驱体法制备出了BiScO3-xPbTiO3-yPb(Yb1/2Nb1/2)O3 (BS-xPT-yPYN,y=0.10,0.15,0.20, 0.30)压电陶瓷,研究了PYN物质的量分数y对陶瓷微观形貌、物相组成、相结构、铁电性能以及压电性能的影响.结果表明:随着y的增大,BS-xPT-yPYN压电陶瓷的晶粒尺寸逐渐增大,体系发生菱方相向四方相的转变,压电性能逐渐下降;当y=0.10时,压电陶瓷的矫顽电场强度Ec越高,其剩余极化强度Pr的增长越明显.