CoSb_3基Skutterudite化合物拉曼光谱研究  

Study on Raman Spectra of CoSb_3-Based Skutterudite Compounds

作　　者：彭江英[1] 杨君友[2] 鲍思前[2] 陈跃华[2] 张同俊[2] 

机构地区：[1]华中科技大学机械学院机械设计及汽车工程系,湖北武汉430074 [2]华中科技大学模具技术国家重点实验室,湖北武汉430074

出　　处：《稀有金属材料与工程》2006年第A02期272-275,共4页Rare Metal Materials and Engineering

基　　金：国家重大基础研究支撑项目(2004CCA03200);国家自然科学基金(50401008)资助

摘　　要：Skutterudite材料因具有特殊的晶体结构成为当前最有前途的热电材料之一,为深入研究填充Skutterudite化合物的热传导机制,对化合物的声子振动模式及置换、填充原子对声子模的影响进行了研究。通过对CoSb3,Co3.5Fe0.5Sb12的偏振拉曼谱研究,确认了一个Ag模,且与理论计算吻合较好。对CoSb3,Co3.5Fe0.5Sb12和La0.6Co3.5Fe0.5Sb12拉曼谱的对比研究表明,单纯Fe置换对拉曼谱影响很小,而La部分填充则使部分拉曼峰明显展宽,分析认为,这一现象主要源于填充原子在晶格空隙中的扰动。The Skutterudite family has become one of the most promising thermoelectric materials because of its interesting crystal structure. Raman scattering spectra of the CoSb3-based Skutterudites were investigated to clarify thermal transport mechanism. An Ag mode was identified through polarization measurements and agreed well with theoretically calculated value. Furthermore, the investigation revealed that only Fe substitution had little effect on the Raman spectra, while La partial filling produced large broadening of the vibrational modes. It is analyzed that this phenomena is mainly due to the ＂rattling＂ motion of the filling atom in crystal voids.

关 键 词：热电材料 SKUTTERUDITE 拉曼散射 

分 类 号：TN304.9[电子电信—物理电子学]