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Abstract
An investigation of the variation of lattice parameter with composition over a small range of composition for the phases CoAl and NiAl has confirmed that a peak value occurs and has enabled the corresponding phase-composition to be determined. For CoAl this is close to the ideal 50—50% (atomic) composition, but in the case of NiAl the nickel sites are found to tolerate up to about 1•5% aluminium. The electron to unit cell ratios corresponding to these compositions are 3•00 and 3•04 for CoAl and NiAl respectively.
