钛酸铅纳米晶的拉曼光谱研究  

FT Raman Spectroscopic Research on Lead Titanate Nanocrystals

作　　者：傅宏刚[1,2,3] 赵冰[1,2,3] 丁志立 于海涛[1,2,3] 张新[1,2,3] 强亮生 王旭[1,2,3] 徐蔚青[1,2,3] 

机构地区：[1]黑龙江大学化学化工学院 [2]吉林大学超分子结构与谱学开放实验室 [3]哈尔滨工业大学应用化学

出　　处：《光散射学报》1999年第2期127-131,共5页The Journal of Light Scattering

基　　金：黑龙江省自然科学基金;黑龙江大学杰出青年科学基金

摘　　要：本文测定了不同粒径的钛酸铅纳米晶的ＦＴＲａｍａｎ光谱，确定了各光学声子模的归属，发现Ａ１（１ＴＯ）声子峰的多重劈裂特征，支持了Ｆｏｓｔｅｒ等人的非谐性振动模型。粒径和温度的变化将使声子频率发生位移并带来峰宽的变化，Ａ１（ＴＯ）模比对应的Ｅ（ＴＯ）模频移速度快，当由铁电相到达居里点时，二者将在某一较低频率处汇合。FT Raman spectra of lead titanate nanocrystals of different grain sizes were measurcd and all optical phonon modes were assigned. The result indicated that the A 1(1TO) phonon appears to be split into multiple peaks which supported the anharmonic vibration model proposed by Foster et al. Changing the grain size and temperature can down shift the phonon frequency lower and broaden width. Furthemore, Below T c the frenquency of the A 1(iTO) mode downshifts faster than corresponding E(iTO) mode.

关 键 词：钛酸铅 纳米晶 拉曼光谱 软模 声子 

分 类 号：O734.1[理学—晶体学] O614.433