Une nouvelle transition ordre-désordre dans Fe-Ni (50-50 )

Paulevé, J.; Dautreppe, D.; Laugier, J; Néel, Louis

doi:10.1051/jphysrad:019620023010084100

Cited by 87 publications

(47 citation statements)

References 3 publications

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“…As is represented in Figure 1 cited from the authors' previous study, [10] an encouraging finding was the fact that an L1 0 -ordered phase, which does not appear in a conventional binary phase diagram, [11] was predicted as a stable phase for the Fe-Ni system. In fact, the stability of an FeNi L1 0 -ordered phase has been suggested by recent theoretical [11,12,13] and experimental [14][15][16][17][18] studies. These facts support the adoption of Ni as a candidate element.…”

Section: Introductionmentioning

confidence: 92%

Phenomenological calculation of the Fe-Pd-based L10-ordered phase in the Fe-Pd-Ni ternary system

Horiuchi

Igarashi

Abe

et al. 2005

Metall Mater Trans A

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A phenomenological calculation of phase equilibria by combining the cluster variation method (CVM) with the Lennard-Jones-type (L-J-type) pairwise atomic interaction energies has been attempted for the Fe-Pd-Ni ternary system in order to examine the possibility of Ni as the substituting element for Pd. The calculated Ni content in an Fe-Pd-based L1 0 ordered phase at 863 K shows fairly good agreement with the experimental analysis performed for Fe-5Pd-5Ni alloy by energy-dispersive X-ray spectroscopy of a transmission electron microscope. The detailed calculation indicates that Ni is preferentially substituted in a Pd site in the L1 0 -ordered phase, which can be interpreted by the Lennard-Jones-type pairwise potentials employed for the present study. It is concluded from the thermodynamic point of view that Ni is a promising candidate as the substituting element for Pd in an Fe-Pd-based L1 0 ordered phase.

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Section: Introductionmentioning

confidence: 92%

Phenomenological calculation of the Fe-Pd-based L10-ordered phase in the Fe-Pd-Ni ternary system

Horiuchi

Igarashi

Abe

et al. 2005

Metall Mater Trans A

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“…The FeNi alloy begins to order at a critical temperature around 593 K, [49] and FeNi 3 begins to order at a critical temperature around 770 K. [50,51] Moreover, the Curie temperature for the ordered alloys is different from that in chemically disordered fcc Fe-Ni alloys of these two phases. [50] The diffusivity in both of these ordered alloys will be affected not only by magnetic spin ordering, but also by chemical ordering.…”

Section: B Fcc Fe-ni Alloysmentioning

confidence: 99%

Magnetic contribution to the interdiffusion coefficients in bcc (α) and fcc (γ) Fe-Ni alloys

Yang

Goldstein

2004

Metall Mater Trans A

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The interdiffusion coefficients in bcc (␣) and fcc (␥) Fe-Ni alloys below their Curie temperatures have been calculated based on the magnetic contribution to the free energy for interdiffusion. The free energy for interdiffusion due to magnetic ordering in bcc Fe-Ni alloys is positive. The calculated interdiffusion coefficients in bcc Fe-Ni alloys fit the experimental data quite well. In fcc Fe-Ni alloys, the magnetic contribution to interdiffusion depends on both temperature and composition and is abnormal for Ni compositions in the Invar region. The free energy of vacancy formation is positive and the free energy of vacancy migration is negative, due to the effect of magnetic ordering. The interdiffusion coefficient in the ferromagnetic phase is lower than that extrapolated from the paramagnetic phase for Ni compositions of 50 at. pct and greater and is higher than that extrapolated from the paramagnetic phase for Ni compositions of 40 at. pct and lower.

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“…Starting from Louis Néel results on the relations between ordering phenomena and magnetic properties of binary alloys, the group of the Centre d'Études Nucléaires de Grenoble (CENG), evidenced, in 1962, the presence of an ordered phase, superstructure L 10 , in the neutron irradiated Fe-Ni 50-50 alloys. 2 This phase is distinguishable by the way it is formed and by their structural, themodinamic and magnetic properties.…”

Section: Meteoritic Fe-ni Alloysmentioning

confidence: 99%

Meteorites: messengers from the outer space

Scorzelli¹

2008

J. Braz. Chem. Soc.

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Milhares de meteoróides, corpos sólidos do espaço extra-terrestre, entram na atmosfera da Terra a cada ano. São pedaços de rocha, metal ou aglomerados de rocha e metal, variando em massa de frações de grama a centenas de quilogramas. Aqueles que sobrevivem à passagem através da atmosfera e caem na Terra, são chamados meteoritos. Os meteoritos são as rochas primitivas, tão antigas quanto o Sistema Solar. O estudo desses objetos enigmáticos intriga os cientistas desde tempos antigos, não apenas por seu local de origem, mas também pelas condições que prevaleceram na sua formação, dando origem a estruturas e composições química e mineralógica características. Essas rochas primitivas são mensageiras do espaço extraterrestre que carregam consigo preciosos segredos sobre a formação do Sistema Solar, depende de nós revelá-los. Nesse artigo apresentamos uma revisão do trabalho realizado no Centro Brasileiro de Pesquisas Físicas (CBPF/MCT), aplicando a espectroscopia Mössbauer ao estudo do sistema Fe-Ni meteorítico.Tens of millions of meteoroids, solid bodies from the outer space, enter the Earth´s atmosphere each year. They are pieces of stone, iron or stony-iron conglomerates, ranging in mass from fractions of a gram to hundreds of kilograms. Those that survive the passage through the atmosphere and fall to Earth are called meteorites. Meteorites are the most ancient and primitive rocks as old as the Solar system. The study of these enigmatic objects intrigued scientists since ancient times, not only about their place of origin but also about the conditions that prevailed there and gave rise to their characteristic chemical and mineralogical composition and structures. These primitive rocks are messengers from the outer space that carry with them precious secrets about the formation of the Solar system, depends on us to reveal them. In this paper a review of the work done in the Centro Brasileiro de Pesquisas Físicas (CBPF/MCT), applying the Mössbauer spectroscopy to the study of the meteoritic Fe-Ni system will be reported.

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Une nouvelle transition ordre-désordre dans Fe-Ni (50-50 )

Cited by 87 publications

References 3 publications

Phenomenological calculation of the Fe-Pd-based L10-ordered phase in the Fe-Pd-Ni ternary system

Phenomenological calculation of the Fe-Pd-based L10-ordered phase in the Fe-Pd-Ni ternary system

Magnetic contribution to the interdiffusion coefficients in bcc (α) and fcc (γ) Fe-Ni alloys

Meteorites: messengers from the outer space

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