Abstract
Mossbauer measurements have been done for 2% 57 Fe at A site in NiCr 2 O 4 . Spectra in a finite temperature range around the distortion temperature have shown that the transition has the characteristics of the first order one, and that cubic regions and tetragonal regions coexist with strong interactions between them. From an anomalous spectrum at 4.2 K a plausible spin configuration for Fe 2+ spins has been proposed.
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