Zr_4Co_4Si_7晶体结构的高分辨电子显微分析

金属学报, 1995, 31(7): 289-293.

Zr_4Co_4Si_7晶体结构的高分辨电子显微分析

中国科学院金属研究所固体原子像开放研究实验室

哈尔滨工业大学

关键词：Ｖ相（Ｚｒ_４Ｃｏ_４Ｇｅ_７类型） , crystal structure.HRTEM technique , null

HRTEM STUDY ON CRYSTAL STRUCTURE OF Zr_4Co_4Si_7 COMPOUND

MAO Jian.fu , HE Liantong , YE Hengqiang(Laboratory of Atomic Imaging of Solids , Ihstitute of Metal Research , Chinese Academy of Sciences

Keywords： :V-phase(Zr_4Co_4Ge_7 type) , 晶体结构 , 高分辨电子显微术

利用电子显微分析方法研究了Ｚｒ４Ｃｏ４Ｓｉ７，化合物的晶体结构．选区电子衍射结果表明Ｚｒ４Ｃｏ４Ｓｉ７为体心四方点阵，空间群为Ｉ４／ｍｍｍ．沿［００１］轴拍摄的高分辨像中较大的亮点代表了以Ｓｉ原子为心的反对称四棱柱，小亮点则代表了以Ｃｏ原子为心的Ｓｉ八面体链．利用多层法进行计算机图像模拟计算所得的像与高分辨像匹配良好．本文结果与前人用Ｘ射线单晶衍射方法建立的Ｚｒ４Ｃｏ４Ｓｉ７晶体结构模型相符

A study of the crystal structure of V-phase is preformed on Zr4Co4Si7 compound by means of various electron microscopic techniques.Results of electron diffraction analysis show that Zr_4Co_4Si_7 has a body -centered tetragonal structure with space group I4/mmm.Images taken by a high resolution transmission electron microscope(HRTEM) reveal the structure in atomic level.Big bright spots in [001] HRTEM image represent Ge-centered square antiprism columns,and the eight small bright spots around them represent Co-centered octahedron columns.Good agreement between the observed and simulated images has been obtained and thus confirmed the results proposed earlier by X-ray diffraction analysis.correspondent:MAO Jian fu,postdoctor,(Laboratory,of Atomic Imaginq of Solidy,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110015)

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