Ca^(2+)含量对(Na_(0.5)Bi_(0.5))_(1-x)Ca_xBi_4Ti_4O_(15)层状压电陶瓷的居里温度和性能的影响

Effects of Ca^(2+) content on Curie temperature and properties of(Na_(0.5)Bi_(0.5))_(1-x)Ca_xBi_4Ti_4O_(15) layer-structured piezoelectric ceramics

采用传统固相法制备铋层状(Na0.5Bi0.5)1-xCaxBi4Ti4O15(NCBT)压电陶瓷,其中x=0.1、0.2、0.3和0.4。利用X线衍射仪(XRD)、扫描电子显微镜(SEM)、同步热分析仪(STA)、阻抗分析仪等对陶瓷的结构和性能进行表征,分析不同Ca2+含量对NCBT压电陶瓷的居里温度和压电性能的影响。结果表明:在x=0.3条件下制备的NCBT陶瓷性能最佳,压电常数(d33)为17.7 pC/N,介电常数(εr)和介电损耗(tanδ)分别为163.8和0.28%(频率1 kHz),居里温度(Tc)为647.6℃。

（ Na0.5Bi0.5 ） 1-xCaxBi4Ti4O15 （ NCBT,x = 0. 1,0.2,0. 3,0.4 ） piezoelectric ceramics were pre- pared by conventional solid-state reaction method. X-ray diffraetometer （XRD） , scanning electron micro- scope （SEM）, simultaneous thermal analyzer （STA）, and impedance analyzer were used to investigate the mierostructures and properties of the ceramics,and the Curie temperatures and piezoelectric properties of NCBT piezoelectric ceramics with different Ca2＋ content（x） were discussed. The results indicated that the excellent properties were shown at x = 0. 3, and the piezoelectric constant （ d33 ） , dielectric constant （εr） ,dielectric loss （tanδ） , and Curie temperature （ T ） were 17.7 pC/N, 163.8 （ 1 kHz） ,0. 28% （ 1 kHz） ,and 647.6 ℃ ,respectively.