Magnetic properties of Cu2+ substituted Co-ferrite

An, Sung Yong; Kim, Ic Seob; Song, So Yeon; Hahn, Jin Woo; Hyun, Sung Wook; Kim, Chin Mo; Kim, Chul Sung

doi:10.1016/j.tsf.2011.03.078

Cited by 10 publications

(2 citation statements)

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“…This resulted in strengthening of B-B interaction and weakening of A-B interaction. 47,48 The coercivity value was comparatively low for Cu substituted cobalt ferrite nanoparticles annealed at 400 C, this could be due to the decrease in magneto crystalline anisotropy as observed by An et al 49 The squareness (S) was calculated according to the equation S ¼ M r /M s . 50 3.5.…”

Section: Magnetic Measurementsmentioning

confidence: 96%

Facile protocol for reduction of nitroarenes using magnetically recoverable CoM_0.2Fe_1.8O₄ (M = Co, Ni, Cu and Zn) ferrite nanocatalysts

et al. 2015

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GRAPHICAL ABSTRACT:Cu ions occupy the catalytically active octahedral sites of the ferrite sub-lattice and present a synergistic effect due to the formation of Cu-Co and Cu-Fe ion pairs which triggers up the catalytic performance of CoCu 0.2 Fe 1.8 O 4 ferrite nanoparticles for the reduction of nitroarenes. AbstractTransition metal doped cobalt ferrite (CoM 0.2 Fe 1.8 O 4 (M= Co, Ni, Cu, Zn)) nanoparticles were fabricated using the sol-gel methodology. The obtained ferrite nanoparticles were annealed at 400 °C and characterized using Fourier transform infra-red spectroscopy (FT-IR), X-ray diffraction (XRD), High resolution transmission electron microscopy (HR-TEM), Vibrating sample magnetometer (VSM) and Energy dispersive X-ray (EDX) and Scanning transmission electron microscopy (STEM). In the FT-IR spectra two bands in the range 1000-400 cm -1 were observed corresponding to the M-O bond in the tetrahedral and octahedral sites. XRD patterns confirmed the formation of cubic spinel structure with Fd-3m space-group. HR-TEM analysis revealed the quasi-spherical shape with particle size in the range 20-30 nm for all the synthesized ferrite nanoparticles. The lattice inter-planar distance of 0.29, 0.25, 0.21 and 0.16 nm obtained from HR-TEM corresponding to (2 2 0), (3 1 1), (4 0 0) and (5 1 1) lattice planes respectively were in complete agreement with the XRD data. The EDX-STEM confirmed the elemental composition as per the desired stoichiometric ratio. The catalytic efficiency of the synthesized ferrite samples was explored for the reduction of nitrophenols. Cu substituted cobalt ferrite nanoparticles (CoCu 0.2 Fe 1.8 O 4 ) possessed excellent catalytic activity while CoM 0.2 Fe 1.8 O 4 (M= Co, Ni and Zn) were inactive for the same. Substrate scope of the developed protocol was also evaluated for the reduction of various CH 3 -, NH 2 -, Br-, Cl etc. substituted nitroaromatic compounds. Research highlights:• CoM 0.2 Fe 1.8 O 4 (M= Co, Ni, Cu, Zn) fabricated by sol-gel methodology.• Comparative catalytic efficiency of transition metal doped cobalt ferrites.• CoCu 0.2 Fe 1.8 O 4 as excellent catalysts for the reduction of nitroarenes.• Facile protocol for the synthesis of aromatic amines Keywords:Catalytic reduction Nitroarenes Magnetically recoverable nanoferrites Catalytically active octahedral sites Synergistic effect

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Section: Magnetic Measurementsmentioning

confidence: 96%

Facile protocol for reduction of nitroarenes using magnetically recoverable CoM_0.2Fe_1.8O₄ (M = Co, Ni, Cu and Zn) ferrite nanocatalysts

et al. 2015

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“…Doping with transition metals and rare earths materials is important for dozens of applications . Cobalt ferrites doped with nickel [171][172][173][174][175][176][177][178][179][180][181][182][183][184][185][186][187][188][189][190], zinc , copper [215][216][217][218][219][220][221][222][223][224][225][226][227][228][229], cadmium [230][231][232][233][234][235][236][237][238][239], magnesium [240][241][242][243][244]…”

Section: Doped Cobalt Ferritesmentioning

confidence: 99%

Synthesis, Characterization, and Applications of CoFe2O4 and M-CoFe2O4 (M = Ni, Zn, Mg, Cd, Cu, RE) Ferrites: A Review

Kakati

Rendale²,

Mathad

2021

Int. J Self-Propag. High-Temp. Synth.

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Effects of copper content on the structural and magnetic properties of spinel (Co,Cu)Fe2O4 ferrites

Cao

Zhang

Ren

et al. 2014

J Mater Sci: Mater Electron

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Magnetic properties of Cu2+ substituted Co-ferrite

Cited by 10 publications

References 7 publications

Facile protocol for reduction of nitroarenes using magnetically recoverable CoM_0.2Fe_1.8O₄ (M = Co, Ni, Cu and Zn) ferrite nanocatalysts

Facile protocol for reduction of nitroarenes using magnetically recoverable CoM_0.2Fe_1.8O₄ (M = Co, Ni, Cu and Zn) ferrite nanocatalysts

Synthesis, Characterization, and Applications of CoFe2O4 and M-CoFe2O4 (M = Ni, Zn, Mg, Cd, Cu, RE) Ferrites: A Review

Effects of copper content on the structural and magnetic properties of spinel (Co,Cu)Fe2O4 ferrites

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Magnetic properties of Cu2+ substituted Co-ferrite

Cited by 10 publications

References 7 publications

Facile protocol for reduction of nitroarenes using magnetically recoverable CoM0.2Fe1.8O4 (M = Co, Ni, Cu and Zn) ferrite nanocatalysts

Facile protocol for reduction of nitroarenes using magnetically recoverable CoM0.2Fe1.8O4 (M = Co, Ni, Cu and Zn) ferrite nanocatalysts

Synthesis, Characterization, and Applications of CoFe2O4 and M-CoFe2O4 (M = Ni, Zn, Mg, Cd, Cu, RE) Ferrites: A Review

Effects of copper content on the structural and magnetic properties of spinel (Co,Cu)Fe2O4 ferrites

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Facile protocol for reduction of nitroarenes using magnetically recoverable CoM_0.2Fe_1.8O₄ (M = Co, Ni, Cu and Zn) ferrite nanocatalysts

Facile protocol for reduction of nitroarenes using magnetically recoverable CoM_0.2Fe_1.8O₄ (M = Co, Ni, Cu and Zn) ferrite nanocatalysts