Magnetic susceptibility of Mn 3 B 4 with D7 b type structure was measured in the temperature range from liq. N 2 temperature to c.a. 900°K. Magnetic characteristic of Mn 3 B 4 is assured to be antiferromagnetic and shows a sharp peak at 392°K. Experimental results suggest that an antiferromagnetic ordering in this phase consists of a +-+- stacking of ferromagnetic layers. An abrupt decrease in magnetic susceptibilities was observed below 226°K, and is ascribed to a transition to canted or conical screwed ordering in the layers.
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Hirota et al. (1965) studied this question.
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