CARRIER CORE MATERIAL FOR ELECTROPHOTOGRAPHIC DEVELOPING AGENT, PROCESS FOR PRODUCING THE CARRIER CORE MATERIAL, CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPING AGENT, AND ELECTROPHOTOGRAPHIC DEVELOPING AGENT

摘要

To provide a carrier for electrophotographic developer, capable of realizing a high image quality and full colorization and reducing carrier scattering, and a manufacturing method of the same, and an electrophotographic developer containing the carrier. A carrier core material for electrophotographic developer, with a general formula expressed by Mg x Mn (1-x) Fe y O 4 (where 0 < x < 1, and 1.6 ‰¤ y ‰¤ 2.4), wherein a half-value width B of a peak having a maximum intensity in a powder XRD pattern satisfies B ‰¤ 0.180 (degree), is manufactured and from this carrier core material for electrophotographic developer, the carrier for electrophotogrphic developer and the electrophotographic developer are manufactured.