On the Magnetic Properties of Cr₂As and Cu₂Sb

Abstract

The thermomagnetic properties of the compound Cr 2 As and Cu 2 Sb were investigated together with the phase diagram of Cr–As system. From the results of thermal and thermomagnetic measurements for Cr 2 As and Cu 2 Sb it was found that they show antiferromagnetic behavior with the Néel point at 393°K and at 373°K respectively. Their reciprocal susceptibilities obey the Curie-Weiss law in high temperature range, but a considerable deviation therefrom is seen just above the Néel point. From the Curie constant obtained by the present experiment, the effective magneton number µ eff of the magetic carrier was calculated to be 3.6 and 2.6 for these compounds, Cr 2 As and Cu 2 Sb, respectively. The total heat absorptions due to the vanishing of antiferromagnetic order in spin arrangement were 50 Cal/mol and 20 Cal/mol. A discussion is given on the origin of the above-mentioned magnetic properties.