Ferrite particles, electrophotographic developer carrier core material, electrophotographic developer carrier, and electrophotographic developer
AssigneePowdertech Co., Ltd.
InventorsMakoto Ishikawa, Tetsuya Uemura
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Abstract
The present invention relates to a ferrite particle containing a crystal phase component containing a perovskite crystal represented by a compositional formula: RZrO3 (provided that R represents an alkaline earth metal element), having a surface roughness Rz of 0.8 μm or more and 3.5 μm or less, and having a standard deviation Rzσ of the surface roughness Rz falling in a range represented by the following formula 0.15×Rz≤Rzσ≤0.60×Rz. The ferrite particle can be used as an electrophotographic developer carrier core material. In addition, an electrophotographic developer carrier and an electrophotographic developer can be obtained.
Claims11
A ferrite particle,
- comprising a crystal phase component comprising a perovskite crystal represented by the compositional formula:
- RZrO3 (provided that R represents an alkaline earth metal element),
- having a surface roughness Rz of 0.8 μm or more and 3.5 μm or less, and
- having a standard deviation Rzσ of the surface roughness Rz falling in a range represented by the following formula:
- 0.15×Rz≤Rzσ≤0.60×Rz (1)
- comprising the crystal phase component comprising the perovskite crystal in an amount of 0.05% by mass or more and 4.0% by mass or less when a phase composition analysis of a crystal phase constituting the ferrite particle is performed by a Rietveld analysis of an X-ray diffraction pattern.
Dependencies are inferred from the claim text.