Magnetic susceptibilities of UO2ZrO2 solid solutions |
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Authors: | Yukio Hinatsu Takeo Fujino |
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Affiliation: | Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki, Japan |
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Abstract: | The magnetic susceptibility of cubic solid solutions of UO2 and ZrO2 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 ZrO2 concentration. The solid solutions of UO2 diluted with 0 ~ 20 mole% ZrO2 show an antiferromagnetic transition and have a linear dependence of Néel temperature on concentration, with a critical concentration of 78 mole% UO2. The molecular field theory which includes next-nearest-neighbor interaction was applied to the results. The interaction between nearest-neighbor spins, J1, decreases with increasing ZrO2 concentration, whereas that between next-nearest-neighbor spins, J2, increases. The behavior of J1 against composition is thought to be caused from the direct effect of magnetic dilution with ZrO2. Regarding the behavior of J2, 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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Keywords: | To whom all correspondence should be addressed. |
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