NDLI: Hard magnetic nanocrystalline alloys of Fe-O system

Content Provider	Springer Nature Link
Author	Yagodkin, Yu. D. Lileev, A. S. Grishina, E. N. Reissner, M. Steiner, W.
Copyright Year	2004
Abstract	The structure and magnetic properties of nanocrystalline Fe-O alloys produced by high-energy ball milling and subsequent low-temperature annealing were investigated. The Fe$_{2}$O$_{3}$, FeO and Fe powders as well as their mixtures were used as starting materials. The structure was studied by X-ray diffraction analysis, Mössbauer spectroscopy and scanning electron microscopy. The magnetic properties were measured in vibrating sample magnetometers at room temperature and 4.2 K. The nanocrystalline composite alloys obtained as a result of the milling contained FeO and α-Fe with an average crystallite size of 15-20 nm as well as an amorphous phase, which was identified as a solid solution of oxygen in iron. However, alloys subjected to subsequent annealing contained only α-Fe and Fe$_{3}$O$_{4}$ with an average crystallite size of about 20 nm. Unlike the starting materials the produced powders had properties which are characteristic of hard magnetic materials. For example, the powder produced by the milling of Fe$_{2}$O$_{3}$+50% α-Fe mixture followed by annealing had the following properties at 300 K: intrinsic coercive force μ$_{0}$ H $_{c}$ = 0.067 T, remanence B $_{r}$ = 0.48 T, energy product (BH)$_{max}$ = 9 kJ/m$^{3}$.
Starting Page	5255
Ending Page	5258
Page Count	4
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	39
Issue Number	16-17
e-ISSN	15734803
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2004-01-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polymer Sciences Industrial Chemistry/Chemical Engineering Characterization and Evaluation Materials Mechanics
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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