Abstract
Variable-temperature magnetic susceptibility shows that electrons on the vanadium centers of the Na+, K+, and Rb+ intercalates of layered vanadyl phosphate are ferromagnetically coupled via V(OPO)2V rings within the layers. The superexchange pathway is preserved in the Sr2+-intercalated system, but antiferromagnetic coupling is observed in the intralayer. This disparate behaviour correlates with the orientation of the basal planes of the (VO)O4 subunits in the X-ray-characterized Rb+-intercalated layered phosphate as well as in the previously characterized Na+, K+, and Sr+ systems.
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