Low Temperature Magnetic Properties of the Bimetallic Compounds [Co(C₅H₅NO)₆](MX₄) (M = Co²⁺, Zn²⁺; X = Cl⁻, Br⁻)
We have measured the specific heat and suceptibility of the compounds [Co(C5H5NO)6] (MX4) (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 Co2+ ions on the octahedral positions of the chlorine compounds exhibit antiferromagnetic ordering at Tc = 0.95(1) K, the Co2+ 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 Co2+ 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. © 1984.
G. Mennenga et al., "Low Temperature Magnetic Properties of the Bimetallic Compounds [Co(C₅H₅NO)₆](MX₄) (M = Co²⁺, Zn²⁺; X = Cl⁻, Br⁻)," Journal of Magnetism and Magnetic Materials, Elsevier, Jan 1984.
The definitive version is available at http://dx.doi.org/10.1016/0304-8853(84)90048-9
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