| 摘要 |
An Li-Mn ferrite carrier comprising 2 to 15 mol % of Li2O, 5 to 30 mol % of MnO and 60 to 90 mol % of Fe2O3. The carrier may contain at least one sintering aid selected from the group consisting of CaO, Na2O, SiO2, V2O5, Al2O3, As2O3, Bi2O3, Sb2O3 and B2O3 to improve the surface properties thereof. The carrier may be made sensitive to the intensity of electric field by regulating the specific volume resistivities at 200 V/cm and 10 kV/cm within the specific ranges. This carrier is particularly suitable in the reversal developing method, and in the developing method where an A.C. bias voltage is superimposed to a D.C. bias voltage.
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