Elaboration, Microstructure, and Magnetic Properties of Nanocrystalline Fe90Ni10 Powders

Kezrane, Mohamed; Guittoum, A.; Hemmous, M.; Lamrani, Sabrina; Bourzami, A.; Weber, W.

doi:10.1007/s10948-015-3059-9

Cited by 12 publications

(6 citation statements)

References 41 publications

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“…The presence of a limited quantity of magnetic Ni atoms as the next neighbor in the neighborhood of the bcc-Fe atoms barely modifies the hyperfine parameters of the Fe nuclei, giving, as a result, independently resolved similar spectral contributions, which are not disclosed, and an apparent widening of the total spectrum of this phase. 31 This fact also hinders any quantization of the Ni content in this solid solution Fe(Ni) by deconvolving the spectrum according with a binomial distribution of Ni atoms in the neighborhoods of the Fe atoms. However, it is clear that the bcc-Fe structure is maintained, and thus, it is estimated that the Ni content remains below 30 atom %.…”

Section: ■ Resultsmentioning

confidence: 99%

High-Performance Magnetic Activated Carbon from Solid Waste from Lignin Conversion Processes. 2. Their Use as NiMo Catalyst Supports for Lignin Conversion

Oregui-Bengoechea

Miletić

Hao

et al. 2017

ACS Sustainable Chem. Eng.

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Lignin conversion processes produce carbon-rich residues [J. Anal. Appl. Pyrolysis2015113713722; Chem. Rev.201011035523599] that can be converted into valuable materials such as magnetic activated carbons (MACs). Such lignin-derived MACs can be further used as functional substrates for hydrotreating NiMo catalysts. In this work, we studied the activity of different NiMo-MACs for the catalytic conversion of lignin in a formic acid/ethanol media (lignin-to-liquid, LtL, process). Two KOH-activated LtL hydrochars from eucalyptus (MACE) and Norwegian spruce (MACS) lignins were used as catalyst supports. In addition, the activity of the resulting NiMo-MACs, namely, C-MACE and C-MACS, was compared with a NiMo catalyst supported on a commercial activated carbon (AC). At reaction conditions of 340 °C and 6 h, the best result was obtained for the NiMo-MACS with a yield of 72.2 wt % of oil and 21.1 wt % of organic solids. At 300 °C and 10 h, both NiMo-MAC catalysts displayed higher hydrodeoxygenation (HDO) activities than their commercial counterpart, yielding considerably higher oil yields. The higher HDO activities are tentatively assigned to the formation of NiFe species on the catalytic surfaces of the NiMo-MAC catalysts. In addition, the magnetism exhibited by the C-MACS made it easy to recover the catalyst. However, a considerable loss of activity was observed upon recycling due to a chemical modification of the catalyst surface.

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Section: ■ Resultsmentioning

confidence: 99%

High-Performance Magnetic Activated Carbon from Solid Waste from Lignin Conversion Processes. 2. Their Use as NiMo Catalyst Supports for Lignin Conversion

Oregui-Bengoechea

Miletić

Hao

et al. 2017

ACS Sustainable Chem. Eng.

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“…The second stage which corresponds to the increase in microdistorsions, <ε>(%), may be due to severe plastic deformations during high energy mechanical grinding. Indeed, the inclusion of Si particles between Fe-Ni powders can cause high microdeformations in the alloy due to its hardness and resistance to deformation [29].…”

Section: Methodsmentioning

confidence: 99%

Silicon-Doped Nanostructured Fe<sub>80</sub>Ni<sub>20</sub> Alloys: The Role of Si on the Microstructure, Morphology and Magnetic Properties

Ourihane

Guittoum²,

Hemmous³

et al. 2022

JNanoR

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Fe(Ni, Si) solid solutions were elaborated by high energy mechanical alloying from elemental Fe, Ni and Si powdersfor a milling time of 72 h. From X-ray diffraction (XRD) analysis, it has been shown that the Fe(Ni, Si) samples present a single phase in the whole range of Si content and exhibit a solid solution of disordered bcc α-Fe. The lattice parameter a (Å) of the new structures and the mean crystallitessize <D> (nm) were found to decrease with increasing Si contents. In contrast, the microstrain behaviour presents two different stages as the Si contents are increased. Scanning Electron Microscopy (SEM) images confirmed the behaviour of the mean crystallites size, where it can be seen that the addition of Si promotes the reduction of the size of powder particles. The saturation magnetization Ms was found to decrease by a factor of almost 1.4 and the coercively was found to increase by a factor of almost 2.4, when the Si content was increased from x= 0 % to x= 20 %. The Mössbauer spectroscopy confirmed the local in site crystal locations of Si and Ni as they diffuse into the matrix of the bcc α-Fe structure to form a solid solution.

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“…Jartych et al [47] found a value of 0.28690 nm after 56 h of milling using a Fritsh P5 planetary ball mill, Guittoum and Boutarfaia [43] obtained a value of 0.28691 nm for Fe80Ni20 alloy prepared by arc melting method, and Li et al [48] found a lattice parameter equal to 0.2850 nm for Fe80Ni20 ultrafine particles prepared by hydrogen plasma reaction. The value of the lattice parameter of FeNi after 20 h is 0.28686 nm, it can be noticed that the milling time affects the lattice parameter, this is due to Ni atoms substitution in the Fe lattice [49][50], while the addition of Graphene slightly increases this parameter to 0.28704 nm. Based on the X-ray diffraction results, when graphene is added to the FeNi mixture, the diffraction peaks will widen due to the insertion of graphene atoms in the FeNi lattice.…”

Section: Evolution Of Crystallite Size Lattice Strain and Lattice Par...mentioning

confidence: 95%

“…Indeed, the stresses through the reverse magnetostriction (magneto-elastic effects) can induce anisotropy that contributes to the coercivity value. In fact, several authors have discussed this effect [9,41,43,49,53,55], i.e., that the effect of internal stresses may be the dominant factor in coercivity and that this effect gives rise to an increase in the coercive field.…”

Section: Magnetic Characterizationmentioning

confidence: 99%

Magnetic and Structural Properties of Fe-Ni and Fe-Ni-Gr Based Nanostructured Alloys Synthesized by Mechanical Alloying

Younes

Amir

Amraoui

et al. 2023

JNanoR

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Nanostructured FeNi and FeNiGr alloys were successfully synthesized by the mechanical alloying technique. The alloys formation and different magnetic properties were studied as a function of milling time in the range of 0 to 30h by X-ray diffraction (XRD) technique, Scanning Electron Microscope (SEM) analysis and a Vibrating Sample Magnetometer (VSM) process. The X-ray diffraction study confirmed the apparition of the α-FeNi alloy after 5h of milling with an average crystallite size of 26.80nm. The crystallite size obtained after 30h of milling is 10.13nm, While, the lattice deformation increases from 0.431 to 0.935%. in addition, the analysis of the magnetization curves of the Fe-Ni alloys revealed original magnetic properties: super paramagnetic behavior, and especially saturation magnetization and significant coercivity. Furthermore, the addition of graphene into FeNi alloy, reduced its crystallite size from 11.56 to 6.65 nm, and increases the lattice strain and lattice parameter from 0.631 to 0.748% and from 0.28686 to 0.28704nm, respectively. Which, enhanced these magnetic properties, by increasing its coercivity (Hc) from 16. 07 to 135.42 Oe and Mr from 1.73 to 5.87 emu/g, while the magnetization saturation is decreased from 153.25 to 123.06 emu/g.

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Elaboration, Microstructure, and Magnetic Properties of Nanocrystalline Fe90Ni10 Powders

Cited by 12 publications

References 41 publications

High-Performance Magnetic Activated Carbon from Solid Waste from Lignin Conversion Processes. 2. Their Use as NiMo Catalyst Supports for Lignin Conversion

High-Performance Magnetic Activated Carbon from Solid Waste from Lignin Conversion Processes. 2. Their Use as NiMo Catalyst Supports for Lignin Conversion

Silicon-Doped Nanostructured Fe<sub>80</sub>Ni<sub>20</sub> Alloys: The Role of Si on the Microstructure, Morphology and Magnetic Properties

Magnetic and Structural Properties of Fe-Ni and Fe-Ni-Gr Based Nanostructured Alloys Synthesized by Mechanical Alloying

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