Abstract
It is found that it is not possible to explain consistently the relative magnitudes of the hyperfine fields at the A and B sites in ferritic spinels in terms of the relative covalence of the Fe3+−O2− bonds alone. While the behavior of Heff(B) at high temperatures has been explained on the basis of a local molecular field model, this model does not account for the presence of several, different B site fields at T/TN, <.1. From measurements on nominally diamagnetic Sb5+ and Sn4+ it is shown that the “super” transferred hyperfine interactions may possibly be used to explain consistently the trends observed in the hyperfine fields in spinel ferrites.
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