| 摘要 |
PURPOSE:Magnetic carrier particles having a wide range of change in resistance value, obtained by constituting a ferrite having a composition shown by a specific formula calculated as a bivalent or trivalent metal oxide. CONSTITUTION:Magnetic carrier particles comprising a ferrite having a composition shown by the formulaIcalculated as a bivalent or trivalent metal oxide. In the formulaI, M is Mg or a combination of Mg with one or more of Zn, Cu, Mn and Co. When M contains Mg and one or more elements, a molar ratio of Mg to M is >=0.05, and x is >=53mol%. MO in the formulaIis preferably a substance shown by the formula II. In the formula II, X is Zn or a combination of mg with one or more of Cu, Mn and Co; Y is >=0.05 and <1. The ferrite particles have a spinel structure, <= about 1,000mu average particle diameter, and about 10<4>-10<14>OMEGA resistance at 100V impressed voltage. |
