NBT基无铅压电陶瓷的拉曼光谱研究

RAMAN SPECTROSCOPY STUDY OF LEAD-FREE PIEZOCERAMIC OF NBT-BT SYSTEM

利用拉曼散射并结合群论系统研究了(Na0.5Bi0.5)(1-x)TiO3-BaxTiO3(简称NBT-BT)的晶体振动及铁电相到顺电相的结构相变。结果表明,在室温下随着Ba2+含量的增加,521.4cm-1光学声子模劈裂为双峰且高频声子模向高频漂移;随着温度的升高,BT含量为6%的样品在460￣620cm-1范围内,高频峰出现了明显的软化现象。因此,通过拉曼散射的分析,可以表征NBT基陶瓷中相结构的变化趋势。

Raman scattering spectroscopy is lesser used to investigate the phase transition of lead-free piezoceramic. Using Raman scattering spectra and Group theory, the lattice vibration and structural phase transition of （Na0.5Bi0.5）（1-4）TiO3-BaxTiO3 （abbr. NBT-BT） crystal were studied in this paper. The results indicate that with the increase doping amount of Ba^2＋, the optical phonon peak at 521.4cm^-1 splits into two peaks clearly and the higher frequency phonon mode shifts to the higher frequency; For x=0.6, the soft mode is soften with the increasing of temperature at 460-620cm^-1. So that, Raman scattering analysis is an effective way to estimate the phase transition trend in NBT-based ceramics.