Abstract
The magnetic susceptibility of UO 2ThO 2 solid solutions has been measured from room temperature to 2.0 K. The magnetic moment and the Weiss constant have been determined in the temperature range in which the Curie-Weiss law holds. For the solid solutions showing antiferromagnetic transition, the Néel temperature has been also determined. These values decrease monotonically with increasing ThO 2 concentration. The results were analyzed using the molecular field theory which includes the interaction between next-nearest neighbor spins. The interactions between nearest neighbor spins, J 1, and those between next-nearest neighbor spins, J 2, both decrease with increasing ThO 2 concentration. The change of J 1 with composition is larger than that of J 2. The effect of magnetic dilution with ThO 2 is considered to be stronger on the interaction between nearest neighbor uranium ions.
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