Effect of short-range order on the magnetic properties of Fe-B-C amorphous alloys: NMR and magnetization measurements

Ge, Shi Hui; Mao, Mx; Chen, GL; Chen, Zh.; Cl, Zhang; Zhang, YD; Hines, W.A.; Budnick, J. I.

doi:10.1103/physrevb.45.4695

Cited by 16 publications

(3 citation statements)

References 13 publications

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“…On the basis of the x-ray diffraction pattern, this peak is attributed to 11 B in BCT Fe 3 B, rather than to o-Fe 3 B. Previous NMR studies on Fe-B amorphous alloys also indicated that low-temperature annealing favours the growth of BCT Fe 3 B [10,14,15,17]. Since the Fe 3 B phase is a metastable one, the crystallization products are dependent on the annealing conditions.…”

Section: Resultsmentioning

confidence: 88%

“…NMR, however, is a good means for investigating the SROs in amorphous materials since it can provide information concerning the local atomic environment. The NMR spectrum in figure 1 shows two peaks centred at about 34.7 and 36.3 MHz, which are attributed to 11 B nuclei in body-centred tetragonal Fe 3 B (BCT Fe 3 B)-like and orthorhombic Fe 3 B (o-Fe 3 B)-like SROs, respectively, on the basis of results from previous NMR studies on Fe-B-based amorphous alloys [10,14,15,17]. The types of the SROs in the amorphous alloy Gd 4 Fe 77.5 B 18.5 are very similar to those in the Nd 4 Fe 77.5 B 18.5 amorphous alloy [5,7].…”

Section: Resultsmentioning

confidence: 98%

“…The temperature was measured at the surface of the samples. The details of the NMR measurements have been described elsewhere [7][8][9][10]. The 57 Fe Mössbauer spectra were recorded at room temperature using a computercontrolled constant-acceleration Mössbauer spectrometer with the 57 Co(Pd) source.…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

The development of the phase composition in melt-spun alloys with thermal treatment: a combined NMR and Mössbauer study

Cheng

Shen

Mao

et al. 1997

J. Phys. D: Appl. Phys.

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The types of atomic short-range orders (SROs) in the amorphous alloy and its crystallization products under different thermal-treatment conditions were investigated by means of spin-echo nuclear magnetic resonance (NMR) and Mössbauer spectroscopy. It was found that there exist two kinds of SROs in the amorphous alloy: body-centred tetragonal (BCT) B- and orthorhombic (o) B-like SROs. The crystallization products differ at various annealing temperatures: the sample annealed at C for 10 min consists of BCT B containing Gd and -Fe, without the phase; the sample annealed at C for 60 min contains BCT B, and -Fe; and the sample crystallized at C for 10 min consists of B, -Fe, and . The experimental results indicate that the NMR peak shifts from 34.7 MHz for pure BCT B in the sample annealed at C for 60 min to 36.0 MHz for the sample annealed at C for 10 min and the relative intensity of the third Mössbauer sub-spectrum, corresponding to the (8g) site of BCT B, is about 6% less than those of the other two. These facts can be explained in terms of the entering of Gd atoms into the BCT B phase.

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 98%

See 1 more Smart Citation

The development of the phase composition in melt-spun alloys with thermal treatment: a combined NMR and Mössbauer study

Cheng

Shen

Mao

et al. 1997

J. Phys. D: Appl. Phys.

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Boron – Carbon – Iron

Rogl

2008

Landolt-Börnstein - Group IV Physical Chemistry

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Exploring Microstructure and Magnetic Domain Evolution in the As-cast Soft Magnetic Fe74B20Nb2Hf2Si2 Alloy: A Comprehensive Study Using STEM, Lorentz TEM, and LM-STEM DPC Microscopy

Czaja,

Rezaei-Shahreza,

Hasani

et al. 2024

Metall Mater Trans A

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This study delves into subtle changes in the microstructure and domain arrangement of a Fe74B20Nb2Hf2Si2 soft magnetic amorphous alloy. Utilizing transmission electron microscopy in Lorentz mode, low-magnification STEM, and differential phase contrast analysis (DPC), the research explores both the as-cast state and annealed samples. The results confirmed the formation of α-Fe, Fe23B6, Fe2(Hf, Nb), and Fe2B crystalline phases with increasing annealing temperature. Consequently, these crystallization stages induce significant alterations in magnetic domain size and spatial distribution due to microstructural changes. As the crystallization temperature rises, the volume fraction of crystalline phases increases, leading to modifications in the arrangement and size of magnetic domains. The decrease in magnetic domain size, associated with the formation of pinning sites during heat treatment, leads to alterations in soft magnetic properties. This includes an increase in coercivity (Hc) up to 40 A/m in the sample annealed at the temperature range of the third crystallization stage compared to the as-cast sample (1.5 A/m). Furthermore, as the annealing temperature rises, there is a corresponding increase in saturation magnetization (Ms), which reached to 1.71 T in the sample annealed within the temperature range of the third crystallization stage. These findings hold substantial implications for the practical applications of the Fe-based soft bulk metallic glasses (BMGs) alloy across various industries.

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Effect of short-range order on the magnetic properties of Fe-B-C amorphous alloys: NMR and magnetization measurements

Cited by 16 publications

References 13 publications

The development of the phase composition in melt-spun alloys with thermal treatment: a combined NMR and Mössbauer study

The development of the phase composition in melt-spun alloys with thermal treatment: a combined NMR and Mössbauer study

Boron – Carbon – Iron

Exploring Microstructure and Magnetic Domain Evolution in the As-cast Soft Magnetic Fe74B20Nb2Hf2Si2 Alloy: A Comprehensive Study Using STEM, Lorentz TEM, and LM-STEM DPC Microscopy

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