Abstract
The magnetic susceptibility of cubic solid solutions of UO 2 and ZrO 2 with a fluorite structure has been measured from room temperature to 2.3 K. The magnetic moment and the Weiss constant have been determined in the temperature range where the Curie-Weiss law holds. These values decrease monotonically with increasing ZrO 2 concentration. The solid solutions of UO 2 diluted with 0 ∼ 20 mole% ZrO 2 show an antiferromagnetic transition and have a linear dependence of Néel temperature on concentration, with a critical concentration of 78 mole% UO 2. The molecular field theory which includes next-nearest-neighbor interaction was applied to the results. The interaction between nearest-neighbor spins, J 1, decreases with increasing ZrO 2 concentration, whereas that between next-nearest-neighbor spins, J 2, increases. The behavior of J 1 against composition is thought to be caused from the direct effect of magnetic dilution with ZrO 2. Regarding the behavior of J 2, the effect of increasing magnetic interaction due to the smaller distance of uranium ions is considered to be stronger than the magnetic dilution effect.
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