Abstract
The simple one-component plasma (OCP) model has been applied to thermodynamic properties of liquid 3d transition metals. For comparison, the results calculated by the hard-sphere (HS) model are also given. The electronic contribution to the entropy and heat capacity has been considered by a rectangular model of the density of states. In spite of the simplicity of the models the calculated values of the entropy, S, the specific heat at constant volume, CV, and the compressibility chi T, are in good agreement with experiment. This indicates that the OCP model, like the HS model, is well suited as a reference liquid for liquid transition metals.