La_xFe_3CoSb_(12)多晶材料的制备和拉曼光谱测定  

Growth and Raman Spectra of La_xFe_3CoSb_(12) Crystals

作　　者：李丽霞[1] 刘宏 王继扬 胡晓波 魏景谦 徐丽[1] 李志峰[2] 

机构地区：[1]山东大学环境科学与工程学院 [2]中国科学院上海技术物理所,上海200083

出　　处：《人工晶体学报》2002年第1期49-53,共5页Journal of Synthetic Crystals

摘　　要：用熔融退火法制备了镧填充方钴矿 (LaxFe3 CoSb12 )多晶热电材料。用背散射方法测定了不同掺镧量晶体的拉曼光谱。我们认为晶格孔隙中镧原子的振颤运动产生了有效的声子散射并使拉曼谱线加宽。随着镧含量的增加 ,镧原子振颤自由度降低 ,谱线的加宽程度减少。The polycrystalline partial filling skutterudite La x Fe 3CoSb 12 ( x =0.2,0.4,0.6 and 0.8) were prepared with melt freeze annealing method.Raman spectra of the materials were determined using backscattering.From the experiments we can conclude that the 'rattling' motion of lanthanum atoms in voids of unit cell produce the effect phonon scattering and make the widen of Raman spectra.With the increase of La amount,the freedom of rattling motion of La atoms decrease and the extent of widen decrease.

关 键 词：LaxFe3CoSb12晶体 方钴矿 振颤运动 拉曼散射 测定 多晶材料 制备 

分 类 号：O753[理学—晶体学] O782