Solid State Reduction and Magnetic Properties of Iron Oxide-Iron System Induced by Ball Milling Process

Chung Hyo Lee

doi:10.3740/MRSK.2024.34.6.309

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2024 Vol.34, Issue 6 Preview Page

Research Paper

Solid State Reduction and Magnetic Properties of Iron Oxide-Iron System Induced by Ball Milling Process 볼밀링에 의한 철산화물-철계의 고상 환원반응 및 자기특성

27 June 2024. pp. 309-314

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Abstract

The structure and magnetic properties of composite powders prepared by ball milling a mixture of Fe₂O₃ ‧ (0.4-1.0)Fe were investigated. Hysteresis loops and differential scanning calorimetry (DSC) curves are used to characterize the materials and to examine the effect of the solid state reaction induced by ball milling. The results showed that a solid state reaction in Fe₂O₃ ‧ (0.4-1.0)Fe clearly proceeds after only 1 h of ball milling. The system is characterized by a positive reaction heat of +2.23 kcal/mole. The diffraction lines related to Fe₂O₃ and Fe disappeared after 1 h of ball milling and, instead, diffraction lines of the intermediate phase of Fe₃O₄ plus FeO formed. The magnetization and coercivity of the Fe₂O₃ ‧ 0.8Fe powders were changed by the solid state reaction process of Fe₂O₃ by Fe during ball milling. The coercivity of the Fe₂O₃ ‧ 0.8Fe powders increased with increasing milling time and reached a maximum value of 340 Oe after 5 h of ball milling. This indicates the grain size of Fe₃O₄ was clearly reduced during ball milling. The magnetic properties of the annealed powders depend on the amount of magnetic Fe and Fe₃O₄ phases.

Keywords

solid state reduction

a positive reaction heat

iron oxide-iron system

magnetic properties

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 34
No :6
Pages :309-314
Received Date : 2024-05-23
Revised Date : 2024-06-03
Accepted Date : 2024-06-04
DOI :https://doi.org/10.3740/MRSK.2024.34.6.309

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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