Phase Analysis of Amorphous and Nanocrystalline FeCuNbSiB Alloys by &lt;sup&gt;57&lt;/sup&gt;Fe Mössbauer Spectroscopy

Zemčík, T.

doi:10.4028/www.scientific.net/kem.81-83.261

Cited by 12 publications

(9 citation statements)

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“…the increase of the low-field peak. Such an evolution can be associated with a lowering of the iron content in the residual amorphous matrix and the increasing number of Fe atoms surrounded by Cu, Nb (X) and B, due to the poor solubility of these elements in the DO 3 Fe, Si phase [27].…”

Section: Intermediate Crystalline Fraction Alloys (>20% and <55%)mentioning

confidence: 99%

Devitrification process of FeSiBCuBbX nanocrystalline alloys: Mössbauer study of the intergranular phase

Borrego

Conde

et al. 2000

J. Phys.: Condens. Matter

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Mössbauer experiments were performed at room temperature using different experimental configurations on several series of nanocrystalline FeSiBCuNbX alloys (X = Zr, Nb, Mo and V) obtained after annealing treatments of melt-spun ribbons. The refinement of Mössbauer spectra allows the kinetics and the local structural rearrangement mechanisms associated with the nanocrystallization process to be compared. The hyperfine field distributions of the intergranular phase show the emergence of a bimodal behaviour that becomes significantly more pronounced from volumetric crystalline fractions estimated at ∼20-25%, regardless of the nature of the substituting element. The hyperfine field distribution can be described by means of two Gaussian components, consistent with of a two-cluster-like model. Such a behaviour can be attributed to the presence of iron-rich and iron-poor zones within the intergranular phase, resulting from the diffusion process. These mechanisms are found to be independent of the nature of X. In addition, strong in-plane magnetic structures are evidenced for Nb-, Mo-, and V-based systems while the magnetic domains tend to be randomly distributed in Zr-based nanocrystalline alloys.

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Section: Intermediate Crystalline Fraction Alloys (>20% and <55%)mentioning

confidence: 99%

Devitrification process of FeSiBCuBbX nanocrystalline alloys: Mössbauer study of the intergranular phase

Borrego

Conde

et al. 2000

J. Phys.: Condens. Matter

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“…The low-field component may correspond to the regions, near the crystalline grains, which contain more non-ferromagnetic atoms such as B, Cu, and Nb [31]. However, the microstructure of the high-field component is similar to that of the amorphous alloy after annealing at 673 K for 1 h. No Fe borides, such as are reported in [33], have been found in our samples. In order to determine the volume fraction of the amorphous matrix V am and its iron content Fe am , we assume that during the crystallization of the samples pre-annealed at 673 K for 1 h no significant structural changes occur in the amorphous matrix.…”

Section: Investigations Of the Sample Microstructurementioning

confidence: 84%

“…The presence of an amorphous matrix with reduced iron content is widely accepted. As for the crystalline α-FeSi phase, some research has found that it has the DO 3 ordered structure [11,27,29,30,32,33]. However, a few papers have reported a bcc iron-silicon phase [28,31].…”

Section: Discussionmentioning

confidence: 99%

“…The Mössbauer spectra were analysed with a least-squares method by superimposing sets of Zeeman sextets. In the fitting procedure, various authors used four [27][28][29][30], five [31,32], six [11], or seven sextets [33] corresponding to the crystalline phase of the nanocrystalline Fe 73.5 Cu 1 Nb 3 Si 13.5 B 9 alloy. As well as the α-FeSi phase of DO 3 structure, iron-boron phases were also found [33].…”

Section: Investigations Of the Sample Microstructurementioning

confidence: 99%

“…In the fitting procedure, various authors used four [27][28][29][30], five [31,32], six [11], or seven sextets [33] corresponding to the crystalline phase of the nanocrystalline Fe 73.5 Cu 1 Nb 3 Si 13.5 B 9 alloy. As well as the α-FeSi phase of DO 3 structure, iron-boron phases were also found [33]. However, the amorphous matrix was interpreted in terms of one sextuplet of broadened lines [11,27], one broad-line sextet [32], two sextets [29,31], or one sextet and one doublet [30].…”

Section: Investigations Of the Sample Microstructurementioning

confidence: 99%

See 2 more Smart Citations

The magnetic after-effect in amorphous and nanocrystalline Fe - Cu - Nb - Si - B alloys

Zbroszczyk¹,

Ciurzyńska²

1997

J. Phys.: Condens. Matter

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The magnetic relaxation phenomenon for the Fe 73.5 Cu 1 Nb 3 Si 13.5 B 9 alloy in the asquenched state and after annealing is investigated. It is stated that the disaccommodation intensity distinctly decreases after the heat treatment of the sample at 673 K for 1 h due to the annealing out of some free volumes. Moreover, the intensity of the disaccommodation drops almost to zero after the sample crystallization occurs. From the results obtained, it becomes evident that the amorphous phase is the main source of the magnetic after-effect in the nanocrystalline samples. The present results are discussed under the assumption that the relaxation processes are described by a gaussian distribution in ln τ .

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Characterization of Nanocrystalline Alloys by Mössbauer Effect Techniques

Miglierini

2003

Nanostructures: Synthesis, Functional Properties and Applications

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Phase Analysis of Amorphous and Nanocrystalline FeCuNbSiB Alloys by <sup>57</sup>Fe Mössbauer Spectroscopy

Cited by 12 publications

References 0 publications

Devitrification process of FeSiBCuBbX nanocrystalline alloys: Mössbauer study of the intergranular phase

Devitrification process of FeSiBCuBbX nanocrystalline alloys: Mössbauer study of the intergranular phase

The magnetic after-effect in amorphous and nanocrystalline Fe - Cu - Nb - Si - B alloys

Characterization of Nanocrystalline Alloys by Mössbauer Effect Techniques

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