LIX. The magnetic moments of cobalt-copper alloys

The rate of change of atomic moment with electron concentration for the high-temperature face-centred cubic form of the solid solution of copper in cobalt has been derived from measurements on the variation of spontaneous magnetization of suitable alloys with temperature. It is quite close to the rate previously observed for solutions of copper in nickel, and the moment extrapolates to a value at the electron concentration of pure nickel which is near that previously measured directly. The Law of Corresponding States does not hold for this system, and the fullness of the reduced magnetization temperature curves increases with the copper concentration, in contrast with the decrease in fullness often observed previously in similar measurements on other alloy systems.