US 12,455,516 B2
Ferrite particle, carrier core material for electrophotographic developer, carrier for electrophotographic developer, and electrophotographic developer
Makoto Ishikawa, Chiba (JP); and Tetsuya Uemura, Chiba (JP)
Assigned to POWDERTECH CO., LTD., Kashiwa (JP)
Appl. No. 18/022,961
Filed by POWDERTECH CO., LTD., Kashiwa (JP)
PCT Filed Aug. 24, 2021, PCT No. PCT/JP2021/030909
§ 371(c)(1), (2) Date Feb. 23, 2023,
PCT Pub. No. WO2022/045097, PCT Pub. Date Mar. 3, 2022.
Claims priority of application No. 2020-140578 (JP), filed on Aug. 24, 2020.
Prior Publication US 2023/0296999 A1, Sep. 21, 2023
Int. Cl. G03G 9/107 (2006.01); C01G 25/02 (2006.01); C04B 35/26 (2006.01); H01F 1/40 (2006.01)
CPC G03G 9/1085 (2020.08) [C01G 25/02 (2013.01); C04B 35/2658 (2013.01); H01F 1/407 (2013.01)] 9 Claims
OG exemplary drawing
 
1. 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.