Crystal field theory developed by Abragam and Pryce is used to formulate the anisotropic exchange interactions in FeCl 2 ·2H 2 O. This crystal is antiferromagnetic in which Fe ++ ions form ferromagnetic linear chains coupling antiferromagnetically to adjacent chains similar to CO ++ ions in CoCl 2 ·2H 2 O and CoBr 2 ·2H 2 O. There are the similar two abrupt jumps in the high-field magnetization to those in CoCl 2 ·2H 2 O and CoBr 2 ·2H 2 O. The numerical values of exchange integrals are estimated. By the use of these values the above magnetization process can be explained. It is predicted that Schottky anomaly in the specific heat may be detected at about 6.4°K.
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Inomata et al. (1967) studied this question.
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