Description of structures in terms of polyhedrapacking |
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Authors: | Kamal Girgis Pierre Villars |
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Affiliation: | 1. Institut für Kristallographie und Petrographie, Eidgen?ssische Technische Hochschule Zürich, CH-8092, Zürich, Switzerland
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Abstract: | The structures of alloys can be described in terms of polyhedrapacking. We studiedall structure types found in the binary systemsT 5 orT 6 withB 3 orB 4 (T 5: V, Nb, Ta;T 6: Cr, Mo, W;B 3: Al, Ga, In, Tl;B 4: Si, Ge, Sn, Pb) elements. Most of the structures examined until now could be built up with one or two polyhedra, only in a few cases more than two polyhedra are required. It is found that there are two types: a three-dimensional distribution of discrete polyhedra sharing corners, edges or faces and a layer-like distribution. This model proved valid for all structure types studied. Classification of the structures according to their polyhedrapacking criteria is introduced (Table 1). Table 2 includes the coordination numbers of all atoms in the studied structures. |
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