Abstract
The magnetic susceptibility of β‘–NiAl has been measured across its composition range as a function of temperature (100 to 1100 K). The susceptibility was found to vary dramatically with sample preparation, particularly for the stoichiometric and Al-rich compositions. It has been deduced that iron contamination causes these variations and the effect of this iron contamination was found to vary greatly between the Ni-rich and Al-rich alloys; possible iron impurity site changes, or changes in the overall electronic structure, are discussed to account for this. The susceptibility of noncontaminated NiAl was found to be virtually independent of temperature. Following these deductions the results of previous workers are reconsidered.
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