原位Raman光谱技术研究PLZT铁电陶瓷相变  

Phase Transitions in PLZT Ceramics Observed by In-situ Raman Spectroscopy

作　　者：张飒[1,2] 刘莹[1] 刘怡萱[1] 程璇[1,2] 张颖[1,2] 

机构地区：[1]厦门大学材料学院材料科学与工程系,厦门361005 [2]福建省特种先进材料重点实验室,厦门361005

出　　处：《无机材料学报》2014年第4期399-404,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(51302236);福建省特种先进材料重点实验室基金(2006L2003)~~

摘　　要：采用传统固相反应法制备了原子比Zr/Ti≈52/48,掺杂少量镧的锆钛酸铅(PLZT)铁电陶瓷材料,X射线衍射分析表明得到的陶瓷粉末样品为纯钙钛矿相。对PLZT铁电陶瓷材料进行不同温度下的原位Raman谱观测,得到了各Raman特征谱的频率和峰强随温度的变化规律。结果表明,从-200℃升温至600℃过程中,准同型相界附近的PLZT铁电陶瓷分别发生了两种相变:在0℃发生了单斜相到四方相的转变,而在350℃发生了四方相到立方相的转变;并且,在-150℃和250℃附近还可能分别发生低温单斜相到高温单斜相和混合相的相变。The PLZT ceramics （atomic ratio Zr/Ti≈52/48, doped with small amounts of La） were prepared by conventional solid state reaction technique and identified to be pure perovskite phase by XRD. To observe the phase transition in the PLZT ceramics, the in-situ Raman spectra were measured at different temperatures. Accordingly, the variations of characteristic Raman shifts and intensities of the modes with temperatures were obtained. It is confirmed that two types of phase transitions near morphotropic phase boundary （MPB） occurred at 0℃ from rhombohedral to tetragonal and at 350℃ from tetragonal to cubic, in the temperature range from -200℃ to 600℃. What＇s more, the phase transitions for rhombohedral from low. to high-temperature phases and mixed phases may take place near -150℃ and 250℃, respectively.

关 键 词：PLZT铁电陶瓷 相变 准同型相界 原位Raman光谱 

分 类 号：TB321[一般工业技术—材料科学与工程]