Abstract
LaNi5, CeNi5, PrNi5 and NdNi5 powders were prepared from the coorresponding oxides by a reduction-diffusion method using calcium as reductant and the morphology of the product and the mechanism of the reaction were examined. It was clarified that CaxNiy compounds formed during the reaciton had a significant role in the formation of RExNiy. Instead of a common direct reaction of xRE + yNi = RExNiy, an indirect substitution reaction of aCaxNiy + bRE =cRExNiy + dCa prevailed. This enhanced the rate of formation of RENi5 significantly.
Original language | English |
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Pages (from-to) | 46-52 |
Number of pages | 7 |
Journal | Journal of Alloys and Compounds |
Volume | 230 |
Issue number | 1 |
DOIs | |
Publication status | Published - 1995 Nov 15 |
Keywords
- Calciothermic reduction
- Rare earth-nickel compounds
- Reaction mechanism
- Reduction-diffusion method
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry