The thermomagnetic properties of a compound Mn 2 As were investigated together with the phase diagram of Mn–As system. From the results of measurements of the temperature dependence of magnetic susceptibility and specific heat of the compound Mn 2 As, it was found that this alloy is antiferromagnetic with the Néel point at 573°K. The reciprocal of its susceptibility obeys the Curie-Weiss law in the high temperature range, but a considerable deviation therefrom can be seen just above the Néel point as in the case of ferrimagnetism. Based on the Curie constant obtained by the present experiment, the effective magneton number was calculated to be 5.2 per manganese ion. The total heat absorption due to the vanishing of antiferromagnetic order of spins in the present alloy was estimated to be 230 Cal/mol. A discussion based on the molecular field theory is given on the nature of the above-mentioned magnetic properties.
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Yuzuri et al. (1960) studied this question.
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