| 摘要 |
Disclosed are a resin-filled ferrite carrier core material for an electrophotographic developer, including a porous ferrite particle, wherein the composition of the porous ferrite particle is represented by the following formula (1), and part of (MgO) and/or (Fe2O3) in the following formula (1) is replaced with SrO; a ferrite carrier obtained by filling a resin in the voids of the ferrite carrier core material; and an electrophotographic developer using the ferrite carrier: ( MgO ) × ( Fe 2 O 3 ) y ( x = 10 mol % or more and less than 25 mol % y = exceeding 75 mol % and 90 mol % or less x + y = 100 mol % ) ( 1 )
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