Magnetic Behavior of the System CoO–MgO at Elevated Temperatures

The magnetic susceptibilities of solid solutions of CoO and MgO have been measured at elevated temperatures. The data fit a Curie-Weiss law ξ = C/(T+Θ) with C = 3.23±0.04. Θ varies linearly with the mole fraction of CoO. The magnetic measurements indicate that CoO has an antiferromagnetic ordering of spins of the first kind below the Curie point.