Magnetization of disordered cold-worked Fe-Al alloys up to 51 at.% Al

Besnus, M.J.; Herr, A.; Meyer, Andreas

doi:10.1088/0305-4608/5/11/026

Cited by 134 publications

(56 citation statements)

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“…This is in disagreement with Oki et al [28] shows also a drastic upturn at low temperature in the C/T versus T 2 representation (Fig. 11) [33,38] and y presents approximatively the same variation with c as X (Figs. 4 and 12).…”

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confidence: 74%

“…It is well known that a relatively small field (100 Oe for example) can be sufficient for changing a spin glass in a ferromagnet [73]. Moreover the curve M versus H at 4.2 K for FeAl [38] is not different from the corresponding curve observed for a well known spin glass as Auo.goFeo.lo [72,78]. It is to be noticed that, in a small field (13 …”

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confidence: 78%

“…The magnetic behaviour depends strongly upon the phase state and upon the atomic arrangement i.e. ordered, partially ordered or disordered structures [2,32,33,36,38,39,42,49,19]. at % Al (after Allen [27] The specific heat has been reported by Beck et a1.…”

mentioning

confidence: 88%

“…It is to be noticed that the magnetic properties of the disordered alloys [38] have been studied in magnetic fields of at least a few kOr,. It is well known that a relatively small field (100 Oe for example) can be sufficient for changing a spin glass in a ferromagnet [73].…”

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confidence: 99%

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Ordering effects in the Fe-Al system

Kuentzler

1983

J. Phys. France

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Ordering effects in the Fe-Al system

Kuentzler

1983

J. Phys. France

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“…In alloys with Al content ranging from 0 to 30 at % the iron atoms carry their normal magnetic moment of 2.2 µ B when they have at least five or more iron atoms as nearest neighbours (6). The 30 at % Al composition is critical for these systems were the average magnetic moment per Fe atom decreases rapidly from 2.0 to 0.7 µ B ; coupled with this there is a large fall in the lattice parameter associated with a fall in the atomic radii as the disorder to order transition occurs (20 to 30 at % Al).…”

Section: Palabras Clave: Aleaciones Fe-al Código Tb-lmto Transformamentioning

confidence: 99%

Propiedades electrónicas y magnéticas de las aleaciones Fe-Al

Apiñaniz¹,

Plazaola²

2000

Bol. Soc. Esp. Ceram. Vidr.

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This work presents ab-initio self-consistent calculations performed with the TB-LMTO code to study the different phases of the Fe-Al phase diagram, corresponding to the ordered structures B2, DO3 and B32 and for Fe 50 Al 50 and Fe 3 Al compositions. Both, unpolarized and spin-polarized calculations have been performed to deduce the energetic difference between the paramagnetic and ferromagnetic state of the corresponding structure. Calculations for the disordered structures have also been performed for the previously mentioned compositions. These results show that by disordering the alloy magnetism is enhanced and that the equilibrium lattice parameter increases. Keywords: Fe-Al alloys, TB-LMTO code, magnetic transformations, order-disorder. Propiedades electrónicas y magnéticas de las aleaciones Fe-AlEn este trabajo se presentan cálculos autoconsistentes ab-initio realizados con el método TB-LMTO (Tight Binding Linear Muffin Tin Orbital) con el fin de estudiar las diferentes estructuras que se presentan en el diagrama de fases de las aleaciones Fe-Al. Se han estudiado las estructuras ordenadas B2, DO3 y B32 para las siguientes concentraciones: Fe50Al50 y Fe3Al. Asimismo, se han realizado cálculos teniendo y sin tener en cuenta la polarización de spin con el fin de poder deducir la diferencia energética entre los estados ferromágneticos y paramágneticos de la misma estructura. Por otra parte se han realizado estos mismos cálculos para estructuras desordenadas y las mismas concentraciones. Los resultados muestran que mediante el desorden aumenta el magnetismo de estas aleaciones y crece el parámetro de red. Palabras clave: Aleaciones Fe-Al, código TB-LMTO, transformaciones magnéticas, orden-desorden.room temperature), B32 long range order was observed by Becker and Schweike in neutron scattering experiments (4). Calculations of model alloys show that the B32 phase has a tendency to exist at even larger deviations from stoichiometry than the B2 phase.It has been shown that these alloys are of the ferromagnetic disordered type (BCC, A2) for Al concentrations up to 23 at % Al independent of heat treatment (5). In alloys with Al content ranging from 0 to 30 at % the iron atoms carry their normal magnetic moment of 2.2 µ B when they have at least five or more iron atoms as nearest neighbours (6). The 30 at % Al composition is critical for these systems were the average magnetic moment per Fe atom decreases rapidly from 2.0 to 0.7 µ B ; coupled with this there is a large fall in the lattice parameter associated with a fall in the atomic radii as the disorder to order transition occurs (20 to 30 at % Al).By disordering the alloy paramagnetic-ferromagnetic transitions can be induced and these transitions could be related to the changes in volume and not only to nearest neighbour effects as is commonly assumed. As an example we can mention that x-ray diffraction of ball milled alloy of composition Fe 60 Al 40 shows an increase of the lattice parameter with milling time (7). This lattice parameter increase has been assumed...

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