Magnetic Susceptibilities of Dilute Solid Solutions of Nickel in Copper at Various Temperatures

New data on the magnetic susceptibilities of the low nickel content end of the nickel-copper alloy series present two main features. At low temperatures an approximation to the usual Curie-Weiss decrease in $\chi$ with increasing $T$ is established, while above room temperature there is an abnormal paramagnetism, $\chi$ increasing with increasing $T$. The variations are continuous with respect to both concentration and temperature. Certain assumptions applied to the Curie-Weiss part of the curves lead to a magnetic moment per Ni atom in the lattice of 0.3 to 0.4 Bohr magnetons.