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<p>Both structures are almost the same, the rhombohedral one is shortened or elongated in the 111 direction</p>
<p>If the cell is shortened then the Ni-Ni distance in the 111 planes is larger than the distance between planes, then there is an antiferromagnetic ordering, with Ni up in one plane and Ni dn in the next.</p>
<p>The cubic FCC has frustration, which leads to non-magnetic ordering or as you say stays paramagnetic.<br>
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<div>Thank you again for the detailed explanation.<br>
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I have some comments to make<br>
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<div>Every one knows that the magnetic ordering of the NaCl structure of NiO is paramagnetic, while that of the rhombohedral structure is antiferromagnetic.<br>
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<div>But, my question is about if we have no information about the material. We have to study the magnetic nature of the material under different crystal structures.<br>
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<div>Thank you again<br>
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<div><font><span style="color:rgb(0,0,255)">Mr: A.Reggad</span>
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<span style="background-color:rgb(238,238,238)"><span style="color:blue">Laboratoire de Génie Physique</span></span><br>
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<font><span style="color:rgb(0,0,255)">Université Ibn Khaldoun - Tiaret</span><br>
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<div><font><span style="font-family:monospace"><span style="color:rgb(0,0,255)">Algerie</span></span></font><br>
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