Magnetic susceptibility measurements have been carried out on the uranium-oxygen system in the composition range of UO₂ to UO2.67. The existence of an antiferromagnetic transition at compositions close to stoichiometric UO₂ which had been previously reported by the authors has been confirmed. The data make it possible to define clearly the phase limits of the UO₂ and U₃{O}₈$ structures and to determine unambiguously that the excess oxygen ions in the nonstoichiometric salts occupy interstitial positions in the lattice.
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Arrott et al. (1957) studied this question.
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