Influence of chemical disorder on the magnetic behaviour and phase diagram of the FexNi1−x system

Lima, Enio; Drago, Valderes

doi:10.1016/j.jmmm.2004.03.020

Cited by 9 publications

(5 citation statements)

References 17 publications

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“…The line widths of the peaks are quite sharp. This pattern (figure 2(b)) gives about the same fraction of fcc phase as estimated from the Lima et al [34] model.…”

Section: X-ray Diffractionsupporting

confidence: 76%

“…From the phase diagram we expect that the homogenized alloy should have crystallized in the α + γ phase. According to the calculations based on the probability distribution of a hyperfine magnetic field by Lima et al [34], for a Ni concentration of 25 at.% the alloys should contain 72-75% of the α-phase and 25-28% of the γ -phase at the low temperature equilibrium. Out of this γ -phase around 20% should be the γ 2 -phase and only 5-8% the γ 1 -phase.…”

Section: X-ray Diffractionmentioning

confidence: 99%

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Anomalous structural and magnetic behaviour of Fe–25 at.% Ni alloy due to mechanical strain

Pandey¹,

Verma²

2007

J. Phys.: Condens. Matter

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Mechanical strain was induced in Fe-25 at.% Ni alloy by filing the ingots into powder form. The phase transformations induced by the deformation thus caused and subsequent annealing were studied by x-ray diffraction, magnetization measurement and Mössbauer spectroscopy. It is concluded that around one-third of the Fe atoms became segregated from the Fe-Ni alloy due to filing. Annealing of the filed powder led to recombination of this segregated Fe to form an apparently body-centred cubic (bcc) phase of Fe-Ni which shows little magnetic ordering at room temperature in magnetization measurements or in Mössbauer spectroscopy. The single-line Mössbauer spectrum of this phase splits into a six-line pattern below 100 K.

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“…The line widths of the peaks are quite sharp. This pattern (figure 2(b)) gives about the same fraction of fcc phase as estimated from the Lima et al [34] model.…”

Section: X-ray Diffractionsupporting

confidence: 76%

Section: X-ray Diffractionmentioning

confidence: 99%

Anomalous structural and magnetic behaviour of Fe–25 at.% Ni alloy due to mechanical strain

Pandey¹,

Verma²

2007

J. Phys.: Condens. Matter

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“…We interpret this single line as the low moment ␥ 1 FCC phase [26,27] that for rich Fe regions coexists with the high-moment ␥ 2 FCC phase [3]. The presence of the ␥ 1 phase for x ≤ 0.30, although in a small quantities, was not predicted by the phase diagram [3,28] and we think that it can be attributed to a local heterogeneity in the chemical composition of these alloys, with the possibility of some iron clustering produced by our preparation method.…”

Section: Resultsmentioning

confidence: 77%

Nanocrystalline FexNi1−x (x≤0.65) alloys formed by chemical synthesis

Lima

Drago

Lima

et al. 2005

Journal of Alloys and Compounds

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“…This calls for a deeper discussion, as the binomial method is a rather standard method which is often and mostly successfully applied. [17][18][19][20][21][22][23][24][25][26][27] First of all, others have warned before us against using the "popular" binomial method uncritically: Szymański et al argue that with the assumption of a linearly varying hyperfine field, a successful fit is almost guaranteed, regardless of whether this assumption is correct or not. 23 They show experimentally that for the Fe 3−x Co x Al system this variation cannot be linear.…”

Section: Analysis and Interpretation Of The Cems Spectramentioning

confidence: 99%

Interpreting Mössbauer spectra reflecting an infinite number of sites: An application toFe1−xSisynthesized by pulsed laser annealing

et al. 2006

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We present a study on the interpretation of conversion electron Mössbauer spectra reflecting an infinite number of sites, in casu Mössbauer spectroscopy on Fe 1−x Si layers on Si, synthesized by pulsed laser annealing. These spectra display a broad double-peaked resonance, reflecting the numerous different environments of the 57 Fe probe due to a distribution of vacancies on the Fe sublattice. The spectra can be fitted in many different ways; hence finding a reliable physical interpretation is not straightforward. Therefore ab initio calculations have been performed in order to obtain a priori information about the hyperfine interaction parameter distributions. For this material, the electric-field gradient on the 57 Fe atoms turns out to depend on details in the configuration of neighbors as far as the sixth neighbor shell. The isomer shift appears to be determined by the number of Fe atoms in the first and second Fe neighbor shells only. This leads to the construction of an ab initio based model predicting the mean isomer shift and its distribution for a given Fe 1−x Si layer with a known Fe concentration profile. By applying this model new information from the experimental data can be extracted: we show that after applying one or two laser pulses, the Fe atoms are not completely randomized at an atomic scale. The relation of this model to other approaches of analyzing Mössbauer spectra with a distribution of sites is discussed, as well as the difference between the present results on ͓CsCl͔Fe 1−x Si and earlier interpretations in the literature. This work reveals how a combination of Mössbauer experiments and ab initio calculations leads to a more reliable interpretation of Mössbauer spectra reflecting an infinite number of sites.

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Influence of chemical disorder on the magnetic behaviour and phase diagram of the FexNi1−x system

Cited by 9 publications

References 17 publications

Anomalous structural and magnetic behaviour of Fe–25 at.% Ni alloy due to mechanical strain

Anomalous structural and magnetic behaviour of Fe–25 at.% Ni alloy due to mechanical strain

Nanocrystalline FexNi1−x (x≤0.65) alloys formed by chemical synthesis

Interpreting Mössbauer spectra reflecting an infinite number of sites: An application toFe1−xSisynthesized by pulsed laser annealing

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