Heat Capacity of CeCo5, PrCo5, NdCo5, SmCo5, and GdCo5 from 5–300 K

The heat capacity, Cp, of CeCo5, PrCo5, NdCo5, SmCo5, and GdCo5 were measured from 5–300 K. Cv/m, the “magnetic” contribution to Cp, was estimated “experimentally”, using the heat capacity of LaNi5 as a “blank”. Cvm was also estimated theoretically, assuming a model which considered the crystal field and molecular field interactions of the rare earth ion. Although most of the gross features of Cvm(expt) vs temperature, T, could be qualitatively reproduced using a point charge‐plus‐molecular field model, some significant features remain unexplained. The magnetic moment of the rare earth sublattice vs T was also estimated.