Nanocrystalline FexNi1−x (x≤0.65) alloys formed by chemical synthesis

Lima, Enio; Drago, Valderes; Lima, J.C. de; Fichtner, P.F.P.

doi:10.1016/j.jallcom.2004.12.011

Cited by 14 publications

(6 citation statements)

References 33 publications

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“…111 is the measured average atomic plane spacing of the (111) planes for each sample.The lattice parameter of the fcc Fe-Ni alloy (3•553 Å) is between those of pure fcc nickel (3•519 Å) and fcc iron (3•588 Å)(Abrahams et al 1962) and is in agreement with the previously reported value for Fe 50 Ni 50 alloy (EnioLima et al 2005). On the other hand, EDS quantitative analysis results in the composition of 47 at.% Fe and 53 at.% Ni, excluding the…”

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Optimum synthesis conditions of nanometric Fe50Ni50 alloy formed by chemical reduction in aqueous solution

et al. 2013

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In the present article, various nanometric Fe 50 Ni 50 alloys were synthesized by chemical reduction of the corresponding metal ions, with hydrazine in an aqueous solution. Process variables of reaction temperature, pH of the hydrazine solution and concentration of metal ions were varied in order to determine the optimum synthesis conditions regarding quality, productivity and cost. It is found that pH of hydrazine solution, at low concentration of metal ions, is the most crucial variable affecting the reaction rate, average crystallite and particle sizes of the synthesized nanometric Fe 50 Ni 50 alloy, followed by the total concentration of metal ions. Thus, increase of pH of hydrazine solution acts as an efficient stabilizer in reducing the particle size. On the contrary, at high concentration of metal ions, the structural characteristics of the nanometric Fe 50 Ni 50 alloy are almost insensitive to reaction temperature and pH of hydrazine solution, but the reduction rate is remarkably sensitive to reaction temperature. Based on these results, it is decided that a reaction temperature of 80 • C, pH of the hydrazine solution of 12•5 and concentration of metal ions of 0•6 M represent the optimum synthesis conditions. The role of pH of hydrazine solution in reducing the alloy's average particle size as well as efficient stabilizer confirms tremendous effect of synthesis conditions on the alloy structure and therefore, the importance of this study for industrial production of nanometric Fe 50 Ni 50 alloy.

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Optimum synthesis conditions of nanometric Fe50Ni50 alloy formed by chemical reduction in aqueous solution

et al. 2013

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“…2, we present the simulated M . for the same alloys produced by chemical coprecipitation [13]. As can be seen in Fig.…”

Section: Resultsmentioning

confidence: 72%

“…We assume that the g 2 -g 1 transition occurs at NN Fe=N c and NNN Fe=M c : The values of N c ¼ 8 and M c ¼ 4 were chosen empirically because they lead to the best results in comparison with the experimental data [13]. However, it was interesting to note that with these figures (N c ¼ 8 and M c ¼ 4), the system attains the concentration ARTICLE IN PRESS of 66.7 at% Fe, being very close to the critical concentration of 65 at% Fe, where Moruzzi [7] found the critical density of 8.6 electrons/atom.…”

Section: Modelmentioning

confidence: 99%

Influence of chemical disorder on the magnetic behaviour and phase diagram of the FexNi1−x system

Lima

Drago

2004

Journal of Magnetism and Magnetic Materials

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“…The spectrum recorded at 77 K displays a broad sextet which can be attributed to several chemical environments of the Fe atoms. The major contributions were found for hyperfine fields between 28 and 32 T corresponding to FeNi x structures . The hyperfine field at 28 T can be attributed to FeNi 3 alloy and corresponds to ca.…”

Section: Figurementioning

confidence: 93%

“…The major contributions were found for hyperfine fields between 28 and 32 T corresponding to FeNi x structures. [35] The hyperfine field at 28 T can be attributed to FeNi 3 alloy and corresponds to ca. 30 % of the sample.…”

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Engineering Iron–Nickel Nanoparticles for Magnetically Induced CO₂Methanation in Continuous Flow

et al. 2020

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Induction heating of magnetic nanoparticles (NPs) is a method to activate heterogeneous catalytic reactions. It requires nano‐objects displaying high heating power and excellent catalytic activity. Here, using a surface engineering approach, bimetallic NPs are used for magnetically induced CO2 methanation, acting both as heating agent and catalyst. The organometallic synthesis of Fe30Ni70 NPs displaying high heating powers at low magnetic field amplitudes is described. The NPs are active but only slightly selective for CH4 after deposition on SiRAlOx owing to an iron‐rich shell (25 mL min−1, 25 mT, 300 kHz, conversion 71 %, methane selectivity 65 %). Proper surface engineering consisting of depositing a thin Ni layer leads to Fe30Ni70@Ni NPs displaying a very high activity for CO2 hydrogenation and a full selectivity. A quantitative yield in methane is obtained at low magnetic field and mild conditions (25 mL min−1, 19 mT, 300 kHz, conversion 100 %, methane selectivity 100 %).

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Nanocrystalline FexNi1−x (x≤0.65) alloys formed by chemical synthesis

Cited by 14 publications

References 33 publications

Optimum synthesis conditions of nanometric Fe50Ni50 alloy formed by chemical reduction in aqueous solution

Optimum synthesis conditions of nanometric Fe50Ni50 alloy formed by chemical reduction in aqueous solution

Influence of chemical disorder on the magnetic behaviour and phase diagram of the FexNi1−x system

Engineering Iron–Nickel Nanoparticles for Magnetically Induced CO₂Methanation in Continuous Flow

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Nanocrystalline FexNi1−x (x≤0.65) alloys formed by chemical synthesis

Cited by 14 publications

References 33 publications

Optimum synthesis conditions of nanometric Fe50Ni50 alloy formed by chemical reduction in aqueous solution

Optimum synthesis conditions of nanometric Fe50Ni50 alloy formed by chemical reduction in aqueous solution

Influence of chemical disorder on the magnetic behaviour and phase diagram of the FexNi1−x system

Engineering Iron–Nickel Nanoparticles for Magnetically Induced CO2Methanation in Continuous Flow

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Engineering Iron–Nickel Nanoparticles for Magnetically Induced CO₂Methanation in Continuous Flow