- Dependence of magnetic properties on structure in the systems NiMoO4 and CoMoO4
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The defect rock-salt phases of NiMoO4 and CoMoO4 were prepared, and their magnetic susceptibilities were measured. The μeff values for nickel and cobalt were consistent with Ni(II) (3d8) and high-spin Co(II) (3d7), and the θ values were 20 and 12 K, respectively. When NiMoO4 or CoMoO4 was pressed at 50 kbar, the resulting product cyrstallized with the wolframite structure. The θ values for the high-pressure phases of nickel and cobalt molybdate were -102 and -105 K, respectively. The difference in the magnetic properties between the high- and low-pressure polymorphs was found to be consistent with the results of an analysis of the magnetic interaction paths in the defect rock-salt structure relative to the wolframite structure.
- Sieber,Kershaw,Dwight,Wold
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p. 2667 - 2669
(2008/10/08)
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