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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Venkatesan, M. Rhen, F.M.F. Gunning, R. Coey, J.M.D. |
| Copyright Year | 2002 |
| Description | Author affiliation: Dept. of Phys., Trinity Coll., Dublin, Ireland (Venkatesan, M.; Rhen, F.M.F.; Gunning, R.; Coey, J.M.D.) |
| Abstract | Summary form only given. Nanocrystalline Sm-Co-Cu-Ti magnets prepared by mechanical milling and subsequent annealing were reported to exhibit excellent room temperature coercivity. In this study, investigations of the effects of Fe, Cu, Zr and Ti substitution on magnetic properties of 1:7 magnets at temperatures up to 450/spl deg/C were investigated. The alloys with nominal composition SmCo/sub 6.6-x/(Fe/Zr)/sub x/Ti/sub 0.4/ (x = 0.0, 0.1 and 0.2) and SmCo/sub 6.8-x/Ti/sub x/Cu/sub 0.1/Fe/sub 0.1/ (x = 0.2, 0.3, 0.4) were prepared by arc melting in a high purity argon atmosphere. The alloy ingots were then crushed and milled for 12 h using high energy ball mill. The as-milled powders were annealed at 750/spl deg/C for 2 hours. X-ray diffraction confirms the formation of TbCu/sub 7/-type structure with minor amounts of the Tb/sub 2/Zn/sub 17/ rhombohedral phase. Grain size is /spl ap/ 40 nm. The authors show the room temperature hysteresis loops of ball-milled SmCo-1:7 compositions with Fe and Zr doping. All compounds exhibit room temperature coercivity of more than 1 T. Substitution of Zr and Ti increases the room temperature coercivity whereas Fe substitution leads to an decrease of the magnetization but a decrease of the coercivity. A room temperature intrinsic coercivity of around 2.5 T is obtained for compositions SmCo/sub 6.4/Zr/sub 0.2/Ti/sub 0.4/ and SmCo/sub 6.4/Fe/sub 0.1/Zr/sub 0.1/Ti/sub 0.4/. |
| Sponsorship | Magnetic Soc. IEEE |
| File Size | 129848 |
| File Format | |
| ISBN | 0780373650 |
| DOI | 10.1109/INTMAG.2002.1000704 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2002-04-28 |
| Publisher Place | The Netherlands |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Zirconium Magnetic properties Magnets Temperature Coercive force Annealing Milling Copper alloys Iron alloys Titanium alloys |
| Content Type | Text |
| Resource Type | Article |
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