HRTEM STUDY ON CRYSTAL STRUCTURE OF Zr_4Co_4Si_7 COMPOUND
Zr4Co4Si7晶体结构的高分辨电子显微分析

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.