Abstract
WE have examined by neutron diffraction a number of samples of polycrystalline manganese arsenide, MnAs, prepared by Mr. A. Bentham by heating manganese and arsenic in a sealed quartz tube, with the view of confirming the antiferromagnetism postulated by Guillaud1 in this material between the two transformation temperatures of about 40° and 130° C. No new reflexions due to antiferromagnetism have been observed, nor have we found any intensity changes within this region greater than the possible experimental errors. It seems clear that any antiferromagnetism must be very weakly developed: unfortunately, the precision of the experiment is much reduced by the fact that the important reflexions (0002) and (10&1bar;1) are almost coincident in the powder diffraction pattern.
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