Pb_(0.85)Ca_(0.15)TiO_3纳米晶铁电—顺电相变的拉曼光谱研究  

FT Raman Spectroscopic Study on the Ferroelectric Paraelectric Transition of Pb 0.85 Ca 0.15 TiO 3

作　　者：傅宏刚[1,2,3] 徐蔚青[1,2,3] 丁志立 强亮生[1,2,3] 于海涛 张新[1,2,3] 王旭 赵冰[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123-126,共4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：采用变温ＦＴＲａｍａｎ技术测定了三种粒径Ｐｂ０．８５Ｃａ０．１５ＴｉＯ３纳米晶的居里温度。１７８９ｎｍ、２５．６９ｎｍ、和３６２５ｎｍ粒子的Ｔｃ分别为２７４℃，２６５℃，２９４℃。认为尺寸效应和掺杂引起的缺陷均对Ｔｃ产生影响。掺杂及焙烧不充分引起的晶体缺陷使居里点弥散。FT Raman spectra of Pb 0.85 Ca 0.15 TiO 3 nanocrystals with different grain sizes were measured from room temperature to past the Curie temperature (T c). to determine the Curie temperature of sample. T c was found to be 274℃, 265℃, and 294℃ for grain size of 17.89nm, 25.69nm, and 36.25nm respectively. The result indicates that both doping effect and size effect can influence T c. Defects in the nanocrystals from doping or insufficient calcination lead to a more diffused T c. At the same time, the E(1TO) soft mode shows a typical underdamp characteristic.

关 键 词：钙改性 钛酸铅 纳米晶 铁电顺电相变 拉曼光谱 

分 类 号：O734.1[理学—晶体学]