Effet Mössbauer en ligne et effet de recul dans les alliages de substitution Fe1-xAlx(b.c.c.) et Fe-Ni (c.f.c.)

Abstract

2014 Les expériences d'effet Môssbauer en ligne sur les alliages de substitution Fe-A1 et Fe-Ni montrent que la fin de l'événement de recul est marquée par l'effrondrement de la zone riche en lacune qui entoure l'atome primaire et son remplissage sélectif par des atomes de fer. Abstract. 2014 On-line Môssbauer experiments show that, in substitutional alloys such as Fe-Al and Fe-Ni, the vacancy rich zone surrounding the primary knock-on collapses at the end of the recoil event. It is preferentially filled by iron atoms.

Isomer shifts and hyperfine fields in iron compounds

“…Guimaraes and Bunbury (1973). Czjzek and Berger (1970), Jeandey and Peretto (1975). Preston and Gerlach (1971), Janot er al(1974).…”

Hydrogen storage in Mg–Ni–Fe compounds prepared by melt spinning and ball milling

“…Another possibility to be ruled out is to assign the main magnetic component of 20 T to Fe dissolved into Mg 2 Ni, which is paramagnetic at room temperature [16]. Regarding Fe-Ni compounds, FeNi 3 , Fe 0.5 Ni 0.5 and Fe 1−x Ni x invar (x = 0.35) have hyperfine magnetic fields of 27.9 T [17], 31.4 T [18], and 23-24 T [19,20], respectively, all higher than 20 T. However, considering that, due to the preparation method and the overall composition of the samples, Mg atoms may be dissolved into grains of a Fe-Ni alloy, depressing the internal field, it is reasonable to attribute the 20 T component to a structure of this kind. The other two minor magnetic components which appear in the Mössbauer spectrum of sample A are attributed to metallic iron (33 T) and a FeNi 3 -like phase (27 T).…”

Mössbauer study of Mg–Ni(Fe) alloys processed as materials for solid state hydrogen storage

“…Another possibility to be ruled out is to assign the main magnetic component of 20 T to Fe dissolved into Mg 2 Ni, which is paramagnetic at room temperature [11]. Regarding Fe-Ni compounds, FeNi 3 , Fe 0.5 Ni 0.5 and Fe 1−x Ni x invar (x=0.35) have hyperfine magnetic fields of 27.9 T [12], 31.4 T [13], and 23÷24 T [14,15], respectively, all higher than 20 T. However, considering that, due to the preparation method and the overall composition of the samples, Mg atoms may be dissolved into grains of a Fe-Ni alloy, depressing the internal field, it is reasonable to attribute the 20 T component to a structure of this kind. The other two minor magnetic components which appear in the Mössbauer spectrum of sample A (Figure 2b) are attributed to metallic iron (33 T) and a FeNi 3 -like phase (27 T).…”