Elastic neutron diffraction experiments have been carried out on the first available NpO2 single crystals. The aim of this experiment was to investigate the 25 K transition occurring in this oxide. As main results of this study no magnetic ordering was detected, the limit of detectability being μord ≤ 0.1 μB per Np atom, and no evidence of a lattice distortion either external or internal was observed. The sensitivity for a possible detection of an oxygen displacement was Δ o ≤ 0.010 A.
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Fournier et al. (1981) studied this question.
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