钛酸铅及掺杂体系纳米晶A_1对称性横光学声子模的特征  

The Raman Scattering Character of the A 1 Symmetric Transverse Optical Mode Phonon in Lead Titanate and Modified Lead Titanate Nanocrystals

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

出　　处：《光散射学报》1999年第2期132-136,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：本文讨论了ＰｂＴｉＯ３、Ｐｂ１－ｘＬａｘＴｉ１－ｘ／４Ｏ３和Ｐｂ１－ｘＣａｘＴｉＯ３纳米晶拉曼散射中Ａ１（ＴＯ）声子峰的不规则线型和多峰劈裂现象。认为以简正振动坐标构成的非谐性双势阱势能函数和Ｍｏｒｓｅ势能函数的Ｓｃｈｒｄｉｎｇｅｒ方程的解与实验观测到的Ａ１（１ＴＯ）模式在高温下的劈裂峰特征比较一致。从能量角度解释了随ｃ／ａ下降，ωＡ１（ＴＯ）快速向低频移动的原因。Anomalous lineshape and multiple splitting of A 1(TO) peaks in the Raman Spectra of PbTiO 3, Pb 1-x La xTi 1-x/4 O 3, and Pb 1-x Ca xTiO 3 nanocrystals were observed Normal vibrational coordinates associated with A 1(iTO) mode were used to constitute the anharmonic double welled potential function and the Morse potential energy function. The solutions of the Schrdinger equation were consistent with the experiment data, indicating that at temperature higher than 373K, the A 1(1TO) mode splits into several peaks with freqency in the range of 90cm -1 to 150cm -1 . The reason why the A 1(TO) mode shifts to a lower frequency faster than other phonon modes as the c/a ratio decreases can be explained well from energy consideration.

关 键 词：改性 钛酸铅 纳米晶 非谐性 声子模 

分 类 号：O734.1[理学—晶体学]