Magnetic susceptibility of Ni‐Al alloys at high temperatures

The mass magnetic susceptibility (χ) has been determined as a function of temperature (T) of binary Ni‐Al alloys, containing 2.1, 4.2, 6.5, 8.7, 11.5 and 16.2 at.% Al, between their ferromagnetic Curie temperatures (TC) and 1500 K. The χ data satisfy the modified Curie‐Weiss law, χ=C/(T−ϑ)+χ0, where C, ϑ, and χ0 are constants, between T′ and 1500 K. The temperature T′ is some minimum temperature which decreases with increasing Al content. The above constants give additional support to the recent interpretation of paramagnetism by Beck and Flynn, postulating the existence of localized magnetic moments up to 1500 K.