Evaluation of hyperfine parameter distributions from overlapped Mossbauer spectra of amorphous alloys

Caër, G. Le; Dubois, Jean‐Marie

doi:10.1088/0022-3735/12/11/018

Cited by 497 publications

(160 citation statements)

References 24 publications

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“…On the other hand, average shifts obtained by all three methods applied are practically the same for all samples. Figure 4 shows distributions obtained with the smoothing parameter [12,13] set to unity, i.e., close to the optimum. However comparable quality fits can be obtained with very large values of the smoothing parameter.…”

Section: Physica Scripta 70mentioning

confidence: 92%

Effect of Pd Impurity on Charge and Spin Density in Metallic Iron Studied by Mössbauer Spectroscopy

2004

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Random iron-palladium alloys of BCC structure and containing up to 10.59 at.% of Pd have been investigated by means of 14.4 keV Mössbauer spectroscopy in 57 Fe at ambient temperature versus Pd concentration. It has been found that the perturbation of the iron hyperfine field caused by Pd impurity extends to the third co-ordination shell around an iron atom. Perturbations caused by single Pd atom located in the first, second and third co-ordination shell, respectively, were determined. It was found that they depend very weakly on the average Pd concentration in the range of concentrations investigated. On the other hand, similar perturbations of the isomer shift extend to greater distances from the impurity. Individual contributions due to Pd impurity in the first, second and third shell, respectively, are seen up to about 5 at.% of Pd. However they are small compared to the change of the average isomer shift due to more distant impurities. One sees the change of the average shift solely for alloys having higher concentration of Pd than 5 at.%. On the other hand, a contribution to the hyperfine field remains constant beyond the third shell at all Pd concentrations investigated. It is the same as the field in pure iron.

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Section: Physica Scripta 70mentioning

confidence: 92%

Effect of Pd Impurity on Charge and Spin Density in Metallic Iron Studied by Mössbauer Spectroscopy

2004

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“…Lattice constant, a, average size of crystallites, <d>, and microstrain, ε, are displayed in Table 1. keV energy were supplied by a Co/Rh source having a nominal activity of 50 mCi. The Mӧssbauer spectra were analyzed by means of a standard hyperfine field distribution (HFD) method [27] assuming a linear correlation between the hyperfine field and the isomer shift [28]. The analysis yielded values of the center shift, CS, as well as HFD histograms.…”

Section: Methodsmentioning

confidence: 99%

Debye temperature of nanocrystalline Fe–Cr alloys obtained by mechanical alloying

Dubiel

Costa

Cieślak

et al. 2015

Journal of Alloys and Compounds

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A series on nanocrystalline Fe 100-x Cr x alloys prepared by mechanical alloying was investigated with Xray diffraction (XRD), scanning electron microscopy (SEM) and Mössbauer spectroscopy (MS) techniques. XRD and SEM were used to structurally characterize the samples whereas MS permitted phase analysis as well as determination of the Debye temperature,  D . Concerning the latter, an enhancement relative to bulk  D -values was revealed in the range of 40  x 50. In a sample of Fe 55.5 Cr 44.5 two phases were detected viz. (1) crystalline and magnetic with  D =572 (56) K and (2) amorphous and paramagnetic with  D =405 (26) K.

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“…Cet élément augmente d'ailleurs la stabilité thermique de nombreux systèmes amorphes, métastables ou cristallisés tels la phase e Fe-C-Si ou le carbure e des aciers au silicium [13]. Le [ 18].…”

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“…Cet effet peut être estimé dans Fe8OB20 à l'aide des largeurs des six enveloppes déterminées par Price et al [20] (Tableau I), en supposant l'identité des angles polaires dans les relations qui traduisent, au premier ordre, l'influence de l'effet quadrupolaire et du champ dipolaire. Une formule approchée [18] [20]). La relation (2) [Experimental [20] and calculated (2) Fe78Si10B12 sous champ appliqué [22] (r 1 > r6l r 3 F4) et de Fe4oNi4oB2o [18].…”

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See 1 more Smart Citation

Etude par spectrométrie Mössbauer d'alliages Fe-Si-B amorphes

Dubois¹,

Bastick²,

Caër³

et al. 1980

Rev. Phys. Appl. (Paris)

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Evaluation of hyperfine parameter distributions from overlapped Mossbauer spectra of amorphous alloys

Cited by 497 publications

References 24 publications

Effect of Pd Impurity on Charge and Spin Density in Metallic Iron Studied by Mössbauer Spectroscopy

Effect of Pd Impurity on Charge and Spin Density in Metallic Iron Studied by Mössbauer Spectroscopy

Debye temperature of nanocrystalline Fe–Cr alloys obtained by mechanical alloying

Etude par spectrométrie Mössbauer d'alliages Fe-Si-B amorphes

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