Etude de l'autodiffusion dans la phase cubique centree de l'europium et du gadolinium

Fromont, M.; Marbach, Gabriel

doi:10.1016/0022-3697(77)90141-x

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Diffusion In Rare-earth Transition Metals Intermetallics1

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2012

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Cited by 16 publications

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“…However, there is data about Fe diffusion inside Nd [36], and this can be useful to understand the diffusion in the Nd-rich phase of Nd 2 Fe 14 B magnets. Data about Nd self-diffusion is not available, but self-diffusion coefficients for Pr [37] and Gd [38] have been reported. Kimura et al [40] estimated the diffusion coefficients of Sm into Sm 2 Co 17 and SmCo 5 , see Table I.…”

Section: Diffusion In Rare-earth Transition Metals Intermetallicsmentioning

confidence: 99%

Diffusion Coefficients of Interest for the Simulation of Heat Treatment in Rare-Earth Transition Metal Magnets

Campos

Flavio²

2012

MSF

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In the case of the modeling of sintering and heat treatments, the diffusion coefficients are an essential input. However, experimental data in the literature about diffusion coefficients for rare-earth transition metal intermetallics is scarce. In this study, the available data concerning diffusion coefficients relevant for rare-earth transition metal magnets are reviewed and commented. Some empirical rules are discussed, for example the activation energy is affected by the size of the diffusing impurity atom. Diffusion coefficients for Dy, Nd and Fe into Nd2Fe14B are given according an Arrhenius equation D=D0exp (-Q/RT). For Dy diffusion into Nd2Fe14B, Q 315 kJ/mol and D08 . 10-4m2/s.

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