par Prigogine, Ilya ;Sarolea, Liliane ;Van Hove, Léon
Référence Transactions of the Faraday Society, 48, 354, page (485-492)
Publication Publié, 1952
Article révisé par les pairs
Résumé : The thermodynamic functions of the Ising model for square and triangular plane lattices were determined exactly by Onsager and Houtappel. These results are used to derive the exact value of the combinatory factor which gives the number of configurations with a pre-assigned number of neighbouring anti-parallel dipoles. The values obtained are compared with the approximate combinatory factor deduced from the quasi-chemical method of Bethe and Guggenheim. For certain simple lattices (square plane lattices, cubic lattices) the quasi-chemical approximation is improved by adding a new parameter chosen to fit the perfectly ordered cases. The approximation thus obtained is remarkably good for the square plane lattice at all temperatures.