Magnetic Properties of the Solid Solutions between KMnF3, KCoF3 and KNiF3

In order to obtain informations on superexchange interaction, the magnetic susceptibility of KNiF 3 and the solid solutions between KMnF 5 , KCoF 3 and KNiF 3 has been measured in the temperature range between 80°K and 850°K. The values of exchange integral | J / k | between the two adjacent magnetic ions are derived by use of the molecular field approximation and by use of the Danielian-Stevens(D-S) procedure as follows:

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