The paramagnetic susceptibilities of solid solutions of MnF2 and ZnF2 have been measured as a function of temperature. The Curie-Weiss law X=C/T+Δ is obeyed by all the solutions examined over the temperature range 76°—295°K. The constant Δ was found to be a linear function of the mole fraction of MnF2. This behavior is consistent with the assumption that the magnetic interaction energy associated with a given ion is proportional to the number of its paramagnetic neighbors.
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