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W. B. Pearson

Interpretation of the positions of phases on near-neighbour diagrams

It has been discovered that interpretation of the positions of intermetallic phases on near-neighbour diagrams ("structural maps" of binary phases that represent the different interatomic distances in the structure by a series of straight lines as a function of the diameter ratio, D_M/D_N) in terms of the interatomic contacts that control the cell dimensions can lead to incorrect conclusions. This situation arises when the value of the constant term k in the equation, a = fD_M + f´D_N + k, representing the linear dependence of the cell dimensions on the diameters of the component atoms, is not small (eg. > 0.2). However, the existence of this constant k and ist significance, is not apparent in the construction or use of near-neighbour diagrams. Following analysis of the situation, rules are given for interpreting the positions of phases on near-neighbour diagrams, and examples are given demonstrating their effectiveness and the errors of interpretation that can otherwise arise.

Zeitschrift für Kristallographie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0044-2968
Volume: 158, 03/1982
Pages: 181 - 196

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