La0.4FeCo3Sb12晶体结构的x射线和电子衍射表征

用粉末x射线衍射结合Rietveld解析方法和电子衍射研究了一种n型La_0.4FeCo3Sb₁₂化合物的晶体结构和演化.二元Skutterudite化合物的晶体结构 中存在一半径为01980nm的结构间隙,可以填入稀土类原子,稀土原子填入后主要引起晶格中Sb原子位置的变 化,稀土原子相对于其他原子具有较大的热振动参数.化合物的电子衍射花样具有体心立方 晶系的消光规律,晶面的衍射强度与粉末x射线衍射的结果完全一致,有序结构引起了个别 强衍射斑点. 关键词： 填充式skutterudite化合物 晶体结构 Rietveld方法 电子衍射

Characterisation of the crystal structure of La0.4FeCo3Sb12 by means of x-ray and electron diffractions

The crystal structure and its evolution of an n type La 0 4 FeCo 3Sb 12 compound have been characterized by the Rietveld refinement and TEM observation. An interstitial site 0 1980nm in radius has been found in the lattice of the binary Skutterudite compound. Filling this interstitial site by rare earth atom mainly results in a change of lattice coordinates of the Sb atom in the compound. Thermal vibration parameter of the rare earth atom is larger than those of other atoms. The electron diffraction patterns confirm the bcc structure of this compound. The intensities of diffraction from different crystallographic planes correspond well between electron and powder x ray diffractions.