A symmetry analysis of possible magnetic structures in crystals with the space group D is made for the wave vector of star { k 12 }. This analysis allows deciphering the neutron diffraction data on the character of antiferromagnetic ordering in the AF 1 (below T 1 = 66 K) and AF 2 (below T 2 = 99 K) phases. It is shown that the magnetic phase transitions arise mainly from the structural transformations that occur at T 1 and T 2 .
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Menshikov et al. (1990) studied this question.
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