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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Kelly, B.G. Unruh, K.M. |
| Copyright Year | 1965 |
| Abstract | Submicrometer-sized Sm-Co powders have been prepared by the calciothermic reduction and subsequent solid-state diffusion of a nanostructured Sm-Co-O/Co-O precursor. The Sm and Co containing precursor was prepared by an autocombustion process. X-ray diffraction identified the product as a mixture of SmCoO3 and Co4 O4. This powder was mixed in a 1:2 mass ratio with CaO (which served as a thermal ballast and aggregation inhibitor) and milled to reduce the particle size below 1 micrometer. Ca metal was added to the mixed powder in amounts between 2 and 6 times those required to reduce the Sm and Co oxides, and sealed in Nb tubes for heat treatment at 900°C for various lengths of time. After cooling to room temperature, metallic Sm-Co particles were isolated from the undesired reaction products by a series of washing steps in acetic acid and ethyl alcohol. The Sm-Co particles were characterized by scanning electron microscopy, vibrating sample magnetometry, and X-ray diffraction. These measurements demonstrated that smaller particle sizes were associated with shorter reaction times and smaller quantities of reducing agent. The formation of hard SmCo5 was systematically associated with either long diffusion times with small amounts of reducing agent, or short diffusion times with large amounts of reducing agent. |
| Sponsorship | IEEE Magnetics Society |
| Starting Page | 3349 |
| Ending Page | 3352 |
| Page Count | 4 |
| File Size | 1148960 |
| File Format | |
| ISSN | 00189464 |
| Volume Number | 49 |
| Issue Number | 7 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2013-07-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Metals Powders Temperature measurement Magnetic properties Coercive force Annealing Inhibitors samarium cobalt alloys Calciothermic reduction hard magnetic materials magnetic particles |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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