Abstract
The magnetic susceptibilities of the dioxide and monocarbide of neptunium have been measured from 4.2 to 350°K. The inverse susceptibility of neptunium dioxide is linear in temperature above 60°K with an effective paramagnetic moment of 2.95 μB. A peak in the susceptibility-vs-temperature curve is observed at 25°K, in agreement with the maximum observed in the specific heat of NpO2. The neptunium monocarbide becomes ferromagnetic below 200°K. A peak in the susceptibility-vs-temperature curve at 310°K indicates a transition from a magnetically ordered arrangement to a paramagnetic one. The effective moment per NpC unit for the ferromagnetic and paramagnetic states is 1.4 μB and 3.37 μB, respectively.
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