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| Reactioin Characteristics of the Sm2Fe17-xGax(x = 0, 2) Alloy with Hydrogen and Methane Gas |
| Journal of Magnetics, Volume 4, Number 4, 31 Dec 1999, Pages 123-127 |
| S. W. Shon(Department of Materials Science and Engineering, The Pukyong National University), H. W. Kwon(Department of Materials Science and Engineering, The Pukyong National University) |
| Abstract |
| The Ga-stabilised Sm2Fe17-type alloy can hardly be disproportionated under ordinary HDDR condition. The HDDR characteristics of Ga-substituted Sm2Fe17-type alloy were examined, and, in particular, the effect of particle size on the disproportionation of the Ga-substituted alloy was investigated in detail. The reaction characteristics of the Sm2Fe17-type alloys with or without Ga-substitution with methane (CH4) gas are also examined. The Ga-stabilised Sm2Fe17-type alloy was able to be disproportionated significantly on heating up to 800 ℃ under hydrogen with normal pressure. The particle size influenced significantly on the disproportion-ation of the Ga-substitute alloy, and the materials with finer particle size (<40 µm) was fully disproportionated on heating up to around 800 ℃ under hydrogen gas with normal pressure. The Ga-substituted alloy has a very sluggish recombination kinetics with respect to the alloy without Ga-substitution. The Sm2Fe17CX-type carbide was stabilised significantly by the Ga-substitution for Fe in the parent alloy. While the Sm2Fe17CX was disproportionated below 800 ℃ the Ga-stabilised Sm2Fe15Ga2CX carbide remained intact even on heating up to 800 ℃. |
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