FERRITE PARTICLE, AND CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPMENT CONTAINING THE SAME, DEVELOPER FOR ELECTROPHOTOGRAPHY, AND METHOD FOR MANUFACTURING FERRITE PARTICLE

摘要

PROBLEM TO BE SOLVED: To provide ferrite particles having desired saturation magnetization and high electric resistance.SOLUTION: The ferrite particles have a composition represented by MgFeO(0≤x≤0.95), wherein the excessive oxygen amount δ in a spinel lattice in the ferrite phase is in the range of 0.01≤δ≤0.18. A method for manufacturing the ferrite particles includes a step of mixing a raw material of Fe and a raw material of Mg in a liquid medium to obtain a slurry, a step of subjecting the slurry to spray drying to obtain particles, and a step of firing the particles to obtain a fired product. Preferably, the firing is carried out under a condition to meet expression (1):-5,000≤T×logP≤0, wherein T is temperature, and Pis oxygen pressure/total pressure.