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Low temperature magnetic properties of the bimetallic compounds [Co(C 5 H 5 NO) 6 ](MX 4 ) (M = Co 2+ , Zn 2+ ; X = Cl - , Br - )

Journal of Magnetism and Magnetic Materials, ISSN: 0304-8853, Vol: 44, Issue: 1, Page: 77-88
1984
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We have measured the specific heat and suceptibility of the compounds [Co(C 5 H 5 NO) 6 ] (MX 4 ) (M = Co, Zn; X = Cl, Br), which are all isostructural and monoclinic. The data show that two magnetic subsystems are present in the Co/Co compounds. The Co 2+ ions on the octahedral positions of the chlorine compounds exhibit antiferromagnetic ordering at T c = 0.95(1) K, the Co 2+ ions on the tetrahedral positions remaining paramagnetic down to at least 0.04 K. The paramagnetic ions appear to experience two different molecular fields from the ordered Co 2+ ions. The behaviour of the bromine compounds is similar, the ordering temperature being about 0.65 K. Both chlorine compounds are apparently canted antiferromagnets. The bromine compounds show compensated antiferromagnetism.

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