Superparamagnetic Behavior of Fe–Ni Alloys at Low Ni Concentration

Kumar, Somesh; Roy, Kamalika; Maity, Kalipada; Sinha, T.P.; Banerjee, Debdas; Das, Kuheli; Bhattacharya, R.

doi:10.1002/(sici)1521-396x(199805)167:1<175::aid-pssa175>3.0.co;2-k

Cited by 18 publications

(8 citation statements)

References 19 publications

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“…The spherical topography in CoFe 2 O 4 displays larger coercivity than the cubic. [55][56][57][58] The surface to volume ratio of smaller particles is much more compared to that of the larger particles. 53 Song et al have reported similar results of variations in coercivity with the shape from spherical to cubic.…”

Section: Magnetic Behaviour Of the Ferritesmentioning

confidence: 99%

Albumin matrix assisted wet chemical synthesis of nanocrystalline MFe₂O₄ (M = Cu, Co and Zn) ferrites for visible light driven degradation of methylene blue by hydrogen peroxide

et al. 2016

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Spinel MFe 2 O 4 (M ¼ Cu, Co and Zn) ferrites have been successfully synthesized via a wet chemical process assisted by albumin matrix and employed as catalyst for methylene blue (MB) degradation. The materials have been characterized by different techniques including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), high resolution transmission electron microscopy (HR-TEM), field emission scanning electron microscopy (FESEM), Raman spectroscopy, Mössbauer spectroscopy, vibrating sample magnetometry (VSM) and N 2 adsorption-desorption isotherm. The crystallite size is found to vary from 13 to 43 nm depending on the calcination temperature and they exhibit low BET surface area. Spherical and rod like surface morphology is obtained for porous copper and zinc ferrite. Copper and cobalt ferrite exhibit ferromagnetic properties typical of nanomaterials. On the other hand zinc ferrite shows superparamagnetic behavior. The current ferrites, specifically copper ferrite, are reported to exhibit significant catalytic activity for the photodegradation of methylene blue in the presence of H 2 O 2 under visible light. All the ferrite materials show better activity in acidic medium.

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Section: Magnetic Behaviour Of the Ferritesmentioning

confidence: 99%

Albumin matrix assisted wet chemical synthesis of nanocrystalline MFe₂O₄ (M = Cu, Co and Zn) ferrites for visible light driven degradation of methylene blue by hydrogen peroxide

et al. 2016

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“…Fe-Ni alloys are considered to be of great importance for various technological applications because of their high saturation magnetization, low coercivity, good anticorrosion properties (Enio Lima 2003a, b), low thermal expansion and excellent mechanical properties (Yeh et al 2004). They also have many anomalies of physical properties such as invar (Kumar et al 1998) and permalloy (Jen et al 1995). These distinctive characteristics are greatly improved when the alloy is synthesized in nanosize range.…”

Section: Introductionmentioning

confidence: 99%

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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“…This system also presents a rich phenomenology such as the Invar [4] and Permalloy [5] properties. In order to extend even more such properties, nanostructured FeNi alloys have been produced according to different methods as, e.g., thermal evaporation [6], electrodeposition [7] and metal-plasma reaction [8] Among these methods, mechanical alloying is one that allows a nanostructured state to be obtained [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Structure, magnetic and Mössbauer studies of mechanically alloyed Fe–20wt.% Ni powders

Hamzaoui

Elkedim

Gaffet

et al. 2006

Journal of Alloys and Compounds

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Superparamagnetic Behavior of Fe–Ni Alloys at Low Ni Concentration

Cited by 18 publications

References 19 publications

Albumin matrix assisted wet chemical synthesis of nanocrystalline MFe₂O₄ (M = Cu, Co and Zn) ferrites for visible light driven degradation of methylene blue by hydrogen peroxide

Albumin matrix assisted wet chemical synthesis of nanocrystalline MFe₂O₄ (M = Cu, Co and Zn) ferrites for visible light driven degradation of methylene blue by hydrogen peroxide

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

Structure, magnetic and Mössbauer studies of mechanically alloyed Fe–20wt.% Ni powders

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Superparamagnetic Behavior of Fe–Ni Alloys at Low Ni Concentration

Cited by 18 publications

References 19 publications

Albumin matrix assisted wet chemical synthesis of nanocrystalline MFe2O4 (M = Cu, Co and Zn) ferrites for visible light driven degradation of methylene blue by hydrogen peroxide

Albumin matrix assisted wet chemical synthesis of nanocrystalline MFe2O4 (M = Cu, Co and Zn) ferrites for visible light driven degradation of methylene blue by hydrogen peroxide

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

Structure, magnetic and Mössbauer studies of mechanically alloyed Fe–20wt.% Ni powders

Contact Info

Product

Resources

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Albumin matrix assisted wet chemical synthesis of nanocrystalline MFe₂O₄ (M = Cu, Co and Zn) ferrites for visible light driven degradation of methylene blue by hydrogen peroxide

Albumin matrix assisted wet chemical synthesis of nanocrystalline MFe₂O₄ (M = Cu, Co and Zn) ferrites for visible light driven degradation of methylene blue by hydrogen peroxide