Isochronal crystallization of metglass Fe83B17 using Mössbauer effect and resistivity measurements

Arshed, M.; Siddique, M.; Anwar-ul-Islam, M.; Ahmad, Asif; Shamim, A.; Butt, N. M.

doi:10.1016/0038-1098(96)00025-7

Cited by 14 publications

(6 citation statements)

References 12 publications

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“…If some uctuations exist in the nearest-neighbour of B atoms, they bound to inuence the electronic structure of B atoms, and consequently, change the hyperne eld and its distribution at B sites [28]. This indicates that boron atom lowers the internal magnetic eld of the system in agreement with one of our earlier study [29]. Details of the Mössbauer parameters of annealed samples are given in Table II.…”

Section: Methodssupporting

confidence: 83%

Study of the Effect of Boron Concentration on Magnetic and Structural Properties of Nd_7.5Pr_2.5Fe_90-xB_xMelt-Spun Alloys

Siddique

Ahmad²,

Kanwal³

et al. 2015

Acta Phys. Pol. A

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The Mössbauer spectroscopy and X-ray diraction techniques have been used to investigate the eect of boron concentration on the structural and magnetic properties of as-quenched and heat-treated melt-spun alloys Nd7.5Pr2.5Fe90−xBx (x = 6, 8, 10) produced by melt-spinning technique. X-ray diraction and Mössbauer spectroscopy results indicate that as-prepared samples are completely amorphous in nature. The X-ray diraction patterns of samples heat-treated at 700• C are indexed as Fe3B, α-Fe, (NdPr)2Fe14B and Fe23B6 phases. The Mössbauer spectra of heat-treated samples are very complex and constituted a number of sextets and a quadrupole doublet. Two main phases are (NdPr)2Fe14B hard and t-Fe3B soft magnetic phases while α-Fe and Nd23Fe6 are detected as minor phases. The average internal magnetic eld decreases with the increase of boron content; more sharply in as-prepared and comparatively slowly in heat-treated samples. The X-ray diraction and Mössbauer spectroscopy results are in good agreement with each other.

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Section: Methodssupporting

confidence: 83%

Study of the Effect of Boron Concentration on Magnetic and Structural Properties of Nd_7.5Pr_2.5Fe_90-xB_xMelt-Spun Alloys

Siddique

Ahmad²,

Kanwal³

et al. 2015

Acta Phys. Pol. A

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“…Identification of this phase from the Mössbauer data is difficult because the parameters given by various authors differ significantly. In some cases the Fe 23 B 6 phase is claimed to be paramagnetic ͑spectrum consists of a quadrupole doublet͒, 29 which seems rather unlikely, whereas in other cases this phase is magnetically ordered with hyperfine fields of about 28.8 and 23.8 T. 28 Since in our case the phase formed is most probably not a pure Fe 23 B 6 but rather (Fe 1Ϫy Ni y ) 23 B 6 , the spectral component related to this phase consists of a broad sextet which may show up in the hyperfine field distribution as a peak at about 28 T. We observed such a case for the spectrum of the x ϭ40 sample annealed at T A ϭ582°C ͑Fig. 7͒.…”

Section: Alloys With High Ni Content (Xä30 and 40)mentioning

confidence: 99%

Mössbauer study of the magnetism and structure of amorphous and nanocrystalline Fe81−xNixZr7B12 (x=10–40) alloys

Kopcewicz

Idzikowski

Kalinowska

2003

Journal of Applied Physics

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Erratum: "Structure, hyperfine interactions, and magnetic behavior of amorphous and nanocrystalline Fe 80 M 7 Structure, hyperfine interactions, and magnetic behavior of amorphous and nanocrystalline Fe 80 M 7 B 12 Cu 1 ( M=Mo , Nb, Ti) alloys Soft magnetic amorphous and nanocrystalline Fe 81Ϫx Ni x Zr 7 B 12 (xϭ0 -40) alloys with very low coercivity and improved mechanical properties, as compared with the NANOPERM alloys, were prepared by a melt-quenching technique. The nanostructure was formed by annealing amorphous precursors in the temperature range T A ϭ440-620°C. Formation of the nanocrystalline phase was studied by Mössbauer spectroscopy, differential scanning calorimetry, and x-ray diffraction techniques. The composition of the nanocrystalline phase strongly depends on the Ni content in the alloy. For xϽ30 the dominating nanocrystalline phase is the bcc Fe, similarly to the NANOPERM alloys. However, the alloy with xϭ40 behaves in a clearly different way. Annealing of the Fe 41 Ni 40 Zr 7 B 12 alloy at T A ϭ520-620°C causes the formation of the nanograins of magnetically ordered cubic (FeNi) 23 B 6 and FeNi phases, as identified by the Mössbauer and x-ray diffraction measurements. Annealing at temperatures exceeding 590°C leads to the Mössbauer spectra at room temperature dominated by a single-line nonmagnetic component. Mössbauer measurements performed at low temperatures reveal a superparamagnetic origin of this spectral component. The superparamagnetic relaxation at the sample surfaces is restricted by the stress induced surface anisotropy related to the crystallization of the amorphous phase as revealed by the conversion electron Mössbauer results. The conversion electron Mössbauer measurements which allowed the comparison of the surface and bulk crystallization of Fe 81Ϫx Ni x Zr 7 B 12 alloys show clear differences between the surface and bulk crystallization for all alloy compositions. Unconventional Mössbauer studies utilizing radio frequency ͑rf͒ fields provide information on the soft magnetic nature of the alloys by observing the degree of rf-induced collapse of the hyperfine fields. The rf-Mössbauer technique, being particularly sensitive to magnetic anisotropy, provided information on the anisotropy fields in the alloys. It was found that the nanocrystalline FeNiB phase is magnetically very soft as revealed by the rf-Mössbauer technique. The complete rf collapse of the magnetic hyperfine structure was observed for the nanocrystalline Fe 41 Ni 40 Zr 7 B 12 alloy in clear distinction to the FeNiZrB alloys with xр30 and to similar earlier studies of NANOPERM alloys. An improved magnetic softness combined with much reduced brittleness of the Fe 41 Ni 40 Zr 7 B 12 samples offer attractive possibilities for technical applications of the nanocrystalline Ni-containing alloys.

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“…In a low temperature range, amorphous alloys exhibit a variety of electrical resistivity, which is temperature dependent due to a lack of the long range order characteristic for the amorphous alloys [9]. The electrical resistivity vs. temperature curve of the amorphous Fe 83 B 17 ribbon displays a discernible fall at some points below the crystallization temperature, ascribed to either some degree of ordering or to transformation of thermodynamically unstable/metastable phases into stable phases [10]. However, there is only a simple temperature coefficient of the electrical resistivity in the other Fe-based glasses [11,12].…”

Section: Introductionmentioning

confidence: 98%

Electrical resistivity evolution in the annealed amorphous Fe78Si9B13 ribbons

Wang

Niu

Wang³

et al. 2008

Journal of Non-Crystalline Solids

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Isochronal crystallization of metglass Fe83B17 using Mössbauer effect and resistivity measurements

Cited by 14 publications

References 12 publications

Study of the Effect of Boron Concentration on Magnetic and Structural Properties of Nd_7.5Pr_2.5Fe_90-xB_xMelt-Spun Alloys

Study of the Effect of Boron Concentration on Magnetic and Structural Properties of Nd_7.5Pr_2.5Fe_90-xB_xMelt-Spun Alloys

Mössbauer study of the magnetism and structure of amorphous and nanocrystalline Fe81−xNixZr7B12 (x=10–40) alloys

Electrical resistivity evolution in the annealed amorphous Fe78Si9B13 ribbons

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Isochronal crystallization of metglass Fe83B17 using Mössbauer effect and resistivity measurements

Cited by 14 publications

References 12 publications

Study of the Effect of Boron Concentration on Magnetic and Structural Properties of Nd7.5Pr2.5Fe90-xBxMelt-Spun Alloys

Study of the Effect of Boron Concentration on Magnetic and Structural Properties of Nd7.5Pr2.5Fe90-xBxMelt-Spun Alloys

Mössbauer study of the magnetism and structure of amorphous and nanocrystalline Fe81−xNixZr7B12 (x=10–40) alloys

Electrical resistivity evolution in the annealed amorphous Fe78Si9B13 ribbons

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Study of the Effect of Boron Concentration on Magnetic and Structural Properties of Nd_7.5Pr_2.5Fe_90-xB_xMelt-Spun Alloys

Study of the Effect of Boron Concentration on Magnetic and Structural Properties of Nd_7.5Pr_2.5Fe_90-xB_xMelt-Spun Alloys