Heat Capacity between 1.8 and 4.2 k of an Iron-Chromium Alloy in the Alpha and Sigma Phases

The alloy contained 44.1 atomic per cent chromium, where the pure sigma phase may be precipitated by prolonged annealing. In the alpha phase the specific heat is almost identical with that of pure iron In the sigma phase however, a larger specific heat appears which is linear with temperature, and this is assumed to be electronic in origin giving for γ, 26.8 × 10-3 J deg-2 mole-1, which is greater than has been observed for any other metal or alloy.