Magnetite and manganese ferrite, fired in various atmospheres, were tested for initial a.‐c. permeability, for quasi‐static hysteresis characteristics of B m , B r , and H c , and for resistivity. Optimum properties were obtained for magnetite made under exactly controlled oxygen pressures and for manganese ferrite fired in a CO 2 atmosphere. These data are discussed with reference to the resistivity as affected by probable cation distribution.
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George Economos (1955) studied this question.
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