High-Temperature Magnetic Susceptibility of Sintered $α MnS$

The magnetic susceptibility of sintered

α MnS

was measured by a Faraday method at temperatures from 300°K to 1244°K. When the data were fitted by a least squares method to the Weiss-Curie law,

χ_{M} = \frac{C_{M}}{(T + θ)}

, using only points above 675°K, values of

C_{M} = 3.94 \pm 0.02

and

θ = 397 \pm 6 °

K were obtained. Even in this range the

\frac{1}{χ}

T

curve was very slightly inflected towards the

\frac{1}{χ}

axis so the above values are considered only as establishing upper limits on the constants. It is suggested that the deviation of

C_{M}

from the theoretical spin only value of 4.379 be interpreted in terms of a reduced ionic character of the MnS bond.

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High-Temperature Magnetic Susceptibility of SinteredαMnS