Ferrite particle, carrier core material for electrophotographic developer, carrier for electrophotographic developer, and electrophotographic developer
AssigneePowdertech Co., Ltd.
InventorsMakoto Ishikawa, Tetsuya Uemura
Life of this patent
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Abstract
The present invention relates to a ferrite particle containing a crystal phase component containing a perovskite-type crystal represented by a composition formula of RZrO3 (wherein R is an alkaline earth metal element), and a Mg content of 0.45 mass % or less. The present invention also relates to a carrier core material for an electrophotographic developer, containing the ferrite particle; a carrier for an electrophotographic developer, containing the ferrite particle and a resin coating layer provided on a surface of the ferrite particle; and an electrophotographic developer containing the carrier for an electrophotographic developer and a toner.
Claims9
A ferrite particle comprising:
- a crystal phase component containing a perovskite-type crystal represented by a composition formula of RZrO3 (wherein R is an alkaline earth metal element),
- a Mg content of 0.45 mass % or less, and
- wherein the crystal phase component containing the perovskite-type crystal is contained in an amount of 0.05 mass % or more and 4.00 mass % or less when a phase composition analysis on a crystal phase constituting the ferrite particle is performed by Rietveld analysis of an X-ray diffraction pattern.
Dependencies are inferred from the claim text.