| 摘要 |
PROBLEM TO BE SOLVED: To provide an iron ion-feeding member capable of feeding more iron ions. SOLUTION: The iron ion-feeding member is formed from an iron-containing material containing 2.5% or more carbon, having a plurality of graphite particles, and having an average distance between graphite particles of not more than 100μm. COPYRIGHT: (C)2011,JPO&INPIT
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