Abstract
Magnetic susceptibilities of Y y U 1− y O 2+ x solid solutions with fluorite structure were measured from 4.2 K to room temperature. An antiferromagnetic transition was observed even for the solid solutions in which the mean uranium valency is over +5. From the comparison of the susceptibility data of oxygen hyper- and hypostoichiometric solid solutions ( x ≷ 0) with those of stoichiometric solid solutions ( x = 0), it was found that both oxygen interstitials and oxygen vacancies weaken the magnetic exchange interactions between uranium ions. With increasing yttrium and oxygen concentrations, the effective magnetic moment of uranium decreased, and the uranium ions were found to be oxidized from +4 to +6 through the +5 state.
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