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Type: Artigo de periódico
Title: Particle Size Dependence Of The Pr2fe17 Nitrogenation Process
Author: Persiano A.I.C.
Ardisson J.D.
Mansur R.A.
Colucci C.C.
Gama S.
Abstract: The particle size dependence of the Pr2Fe17 nitrogenation process at 400°C is determined by the Mössbauer method. The experimental data are described in terms of a particle model consisting of spherical concentrical shells containing: (i) an expanded central core saturated with 2+e{open} atoms N per formula unit; (ii) an intermediate unnitrided shell with a volume larger than the core by a factor of about 2.4 and accommodating a stress/strain field produced by the expanded core, and (iii) an unnitrogenated undeformed external shell. We observed that small particles (d ≤ 10 ώm and most probably lower) tend to absorb higher nitrogen contents than the large ones. Our results also indicate that some small particles, most probably single crystals, do not nitrogenate. © 1994 J.C. Baltzer AG, Science Publishers.
Editor: Baltzer Science Publishers, Baarn/Kluwer Academic Publishers
Rights: fechado
Identifier DOI: 10.1007/BF02074274
Date Issue: 1994
Appears in Collections:Unicamp - Artigos e Outros Documentos

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