Abstract
The preparation of a complete range of solid solutions between the cubic spinel nickel manganite, NiMn 2O 4, and the tetragonal spinel, Mn 3O 4, is described. Studies of the crystal symmetry, the semiconductor behavior and low-temperature magnetization are reported each as a function of composition. Analysis of the crystal-chemical and thermoelectric properties leads to a tentative chemical formula for the system which provides an explanation for the electrical conductivity and magnetization. The conductivity involves the “hopping” of electrons from octahedral-site Mn 3+ ions to octahedral-site Mn 4+ ions. The unpredictable magnetic moments are also accounted for by the properties of octahedral-site Mn 3+ and Mn 4+ ions.
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