Abstract
With the aid of the Ising-Bethe theory it has been shown that the susceptibilities of the three polymorphic forms of MnS can be correlated with the same indirect exchange mechanism as that required to explain the observed magnetic structures. It has also been possible to obtain certain semiquantitative information concerning the Mn-S-Mn indirect exchange interaction. In view of the results reported in this paper, it is recommended that greater use be made of the Ising-Bethe or Bethe-Weiss-Li theories in the interpretation of susceptibility data obtained at temperatures not too far above the Néel temperature.

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