Abstract
The intermetallic compounds U 6Fe and Pu 6 Fe were investigated using Mössbauer spectroscopy. From the Mössbauer point of view the results are straightforward; quadrupole pairs are seen in both materials at room temperature and low temperatures. Low temperature values for the splittings were 0.074 cm/sec for U 6Fe and 0.083 cm/sec for Pu 6Fe; the corresponding room temperature values were 0.069 and 0.073 cm/sec. Both quadrupole splittings and isomeric shift values are characteristic of Fe in the metallic state. Recent electrical resistivity work has established that the temperature curves for Pu 6Fe and Pu metal are qualitatively very similar. In view of this investigation and our Mössbauer results we would be inclined to reject the hypothesis that Pu undergoes an antiferromagnetic transition at low temperatures. However, the situation is complex, and some space is devoted to a review and appraisal of the theories proposed to explain the properties of this most unusual metal.
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