NITROGENATION OF R2FE17 COMPOUNDS - R = RARE-EARTH

被引:121
作者
COEY, JMD
LAWLER, JF
SUN, H
ALLAN, JEM
机构
[1] Department of Pure and Applied Physics, Trinity College
关键词
D O I
10.1063/1.348614
中图分类号
O59 [应用物理学];
学科分类号
摘要
The reaction between nitrogen gas and the series of R2Fe17 intermetallic compounds is studied by thermopiezic analysis on micron-size powders. Nitrogen diffusion in the range 300-550-degrees-C can be represented by an activated interstitial diffusion process D = D0e-E(m)/kT with D0 = 1.95 X 10(-10) m2s-1 and an activation energy E(m) = 0.81 eV. This stage of the nitrogenation reaction leads to the formation of R2Fe17N3-delta nitrides which have structures related to those of the parent compounds. Heating above about 800-degrees-C leads to complete disproportionation of the compounds into a mixture of rare-earth nitride and iron.
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页码:3007 / 3010
页数:4
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