原位Raman光谱技术研究PLZT铁电陶瓷相变

无机材料学报, 2014, 29(4): 399-404. doi: 10.3724/SP.J.1077.2014.13374

原位Raman光谱技术研究PLZT铁电陶瓷相变

张飒 ^1, , 刘莹 ^2, , 刘怡萱 ^3, , 程璇 ^4, , 张颖 ^5,

1.厦门大学材料学院材料科学与工程系,厦门361005;福建省特种先进材料重点实验室,厦门361005

2.厦门大学材料学院材料科学与工程系,厦门,361005

3.厦门大学材料学院材料科学与工程系,厦门,361005

4.厦门大学材料学院材料科学与工程系,厦门361005;福建省特种先进材料重点实验室,厦门361005

5.厦门大学材料学院材料科学与工程系,厦门361005;福建省特种先进材料重点实验室,厦门361005

基金项目: Fujian Provincial Key Laboratory of Advanced Materials(2006L2003) 福建省特种先进材料重点实验室基金(2006L2003) 国家自然科学基金(51302236) National Natural Science Foundation of China(51302236)

关键词： PLZT铁电陶瓷 , 相变 , 准同型相界 , 原位Raman光谱

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

Keywords： PLZT ferroelectric ceramics , phase transition , near morphotropic phase boundary , in-situ Raman spectroscopy

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.

参考文献

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