Magnetic properties of the compounds N(CH3)4MnIIMIII(CN)6 ·8 H2O(MIII = Mn,Fe) |
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Authors: | W Kurtz D Babel |
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Affiliation: | Sonderforschungsbereich 127 and Fachbereich Chemie der Philipps-Universität Marburg, Hans-Meerwein-Strasse, D 3550 Marburg, West Germany |
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Abstract: | In the isostructural cyanobridged chain compounds N(CH3)4MnIIMIII(CN)6 · 8H2O high spin Mn(II) ions couple antiferromagnetically to low spin Mn(III) of Fe(III) ions. The MnII–MnIII compound orders ferrimagnetically below TN = 28.5 ± 1 K. The tetragonal a and b axes are easy ones for the magnetic moments. In the MnII–FeIII compound antiferromagnetic order occurs below TN = 9.3 K, with spins aligned along the tetragonal c axis. The compound undergoes a meta-magnetic transition from the antiferromagnetic to a ferrimagnetic phase. This occurs at 2 K for a field Hcrit ≈ 1.2 T. The temperature dependence of Hcrit, which vanishes at TN, is followed. The tricritical temperature T1 is ~ 5 K. |
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