Abstract
In the first part a new calculation of the paramagnetic susceptibility has been proposed on the basis of the statistical distribution of the thermal energy using the mean value of this energy as statistical variable. The results of the first part are used to calculate the Curie constant of paramagnetic compounds with only one 3d or 4f element. The paramagnetic moment is taken according to Dirac's theory as previously in the calculation of the magnetic moment of a ferromagnetic compound. The basic hypothesis is that the total angular momentum of one electron is the same in a complex atom situated in a solid as in a hydrogen-like atom described in Dirac's theory. The influence of the electronic configuration and the role of the oxydation state for all the paramagnetic moments are studied. This shows an interesting resemblance in their valence properties between EuII and MnII and between GdIII and FeIII. As a conclusion an interpretation of the quantum state is proposed.
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