Structure cristalline de la phase Nb4Fe≈3Si≈5-β et diagramme d'équilibre du système NbFeSi
Structure cristalline de la phase Nb4Fe≈3Si≈5-β et diagramme d'équilibre du système NbFeSi
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DOI：
10.1016/0022-5088(82)90038-8
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发表时间：
1982-09
期刊：
影响因子：
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通讯作者：
B. Malaman;J. Steinmetz;G. Venturini;B. Roques
中科院分区：
文献类型：
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作者：
B. Malaman;J. Steinmetz;G. Venturini;B. Roques
用X射线单晶衍射分析研究了Nb/sub 4/Fe/sub 3/Si/sub 5/Si化物的高温形态。其结构为一种新型结构，空间群为P2/sub 1/mn，Z = 6：a = 12.821（6）A，B = 4.912（1）A，c = 15.521（7）A，R = 0.052（492个独立反射）。这种新型结构的特征在于硅、铁或Fe-Si原子的无限直线链，每个原子被（变形的）正方形、五边形和六边形反棱柱包围。在相邻的化合物结构Nbsub（约2）、FeSisub（约2）、Nb/sub 4/Fe/sub 4/Si/sub 7/、.第阿尔法.. - Nb/sub 4/Fe/sub 3/Si/sub 5/和NbFeSi/sub 2/。
The high temperature form of the Nb/sub 4/Fe/sub 3/Si/sub 5/ silicide was studied by single-crystal X-ray diffraction analysis. The structure is of a new type with space group P2/sub 1/mn and Z = 6: a = 12.821(6) A, b = 4.912(1) A, c = 15.521(7) A; R = 0.052 for 492 independent reflections. This new type of structure is characterized by infinite rectilinear chains of silicon, iron or Fe-Si atoms, each atom being surrounded by (deformed) square, pentagonal and hexagonal antiprisms. Similar chains and polyhedra are also found in the neighbouring compound structures Nbsub(approximately 2)FeSisub(approximately 2), Nb/sub 4/Fe/sub 4/Si/sub 7/, ..cap alpha..-Nb/sub 4/Fe/sub 3/Si/sub 5/ and NbFeSi/sub 2/.