The effects of nitriding on the magnetic properties of Sm–Fe- and Sm–Fe–Ta-based materials
Interstitial Sm–Fe-based nitrides with compositions close to that of Sm 2Fe 17N 3 are an interesting class of hard magnetic materials. In this series of experiments we characterised the nitrogenation process using a vibrating-sample magnetometer (VSM) and a thermogravimetric differential thermal ana...
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Published in | Journal of alloys and compounds Vol. 433; no. 1; pp. 256 - 260 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Lausanne
Elsevier B.V
01.05.2007
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | Interstitial Sm–Fe-based nitrides with compositions close to that of Sm
2Fe
17N
3 are an interesting class of hard magnetic materials. In this series of experiments we characterised the nitrogenation process using a vibrating-sample magnetometer (VSM) and a thermogravimetric differential thermal analyser (TG/DTA). The VSM was fitted with a high-temperature furnace tube and a system for varying the atmosphere around the sample with different gases between 10
−2
mbar and 1
bar. The experiments involved two alloys, with the compositions Sm
13.7Fe
86.3 and Sm
13.8Fe
82.2Ta
4.0, and three different particle sizes, <2
mm, <200, and <15
μm. The results show that the nitriding process is very sensitive to the composition and the particle size, and that nitriding at higher temperatures can result in a nitrogen disproportionation and a loss of the Sm
2Fe
17 phase. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0925-8388 1873-4669 |
DOI: | 10.1016/j.jallcom.2006.06.054 |