Dear wien2k users I have read that the antiferromagnetic ordering is accompanied with a little structural distortion as in the case of NiO. This latter is characterized by a distortion from NaCl to rhomboherdral structure; but for the chromide Cr the structure is still cubic when there is a magnetic transition from paramagnetic to antiferromagnetic state.
Best regards -- Mr: A.Reggad Laboratoire de Génie Physique Université Ibn Khaldoun - Tiaret Algerie
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