The heat capacity anomaly of chromium at 311 K (Antiferromagnetic to paramagnetic transition)

Measurements have been made of the specific heat of polycrystalline chromium in the temperature range 280-330 K. The chromium was heat treated to minimize the effects of internal stress on the magnetic structure which have been described by Bacon and Cowlam. The results are consistent with the occurrence of a first order transformation at about 311 K. An estimate of the minimum total entropy of magnetic disorder has been made and is 70 mJ mol-1K-1. Relaxation effects have been observed.