The magnetic susceptibility of hafnium, which has been measured from 4.2°K to 1670°K, increases with increasing temperature above 77°K. At room temperature, the susceptibility is (0.42±0.01)×${10}^{-6\mathrm{}}$ emu/g.

The susceptibility of manganese between 77°K and room temperature shows a maximum at 125°K. This can be identified with antiferromagnetism by a correlation with neutron diffraction data. In the temperature region below 77°K the susceptibility increases again quite rapidly.

• Received 1 February 1955

DOI:https://doi.org/10.1103/PhysRev.98.936