Abstract
In the series KMF3 the 19F resonance field is displaced from the free ion value by an amount which increases regularly with the number of unpaired electrons in the 3d shell and with decrease in temperature. The absence of a shift in antiferromagnetically ordered KNiF3 is in accordance with an antiparallel arrangement of nearest neighbour spins. The displacement in K2OsF6 cannot be explained by assuming a d4 configuration for the Os4+ ion.
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