IR spectral studies of Co0.6Zn0.4MnxFe2−xO4 ferrites

Hemeda, O. M.

doi:10.1016/j.jmmm.2004.01.100

Cited by 37 publications

(8 citation statements)

References 21 publications

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“…Waldron (1955) assigned the high-frequency band to the tetrahedral group (575 cm -1 region) and the low frequency band to octahedral group (374 cm -1 ). The low frequency band in the range of 370-380 cm -1 is related to the divalent octahedral metal complexes (Hemeda (2004)). The absorption bands at 355 cm -1 and 579 cm -1 corresponds to vibrations of Co↔O and Fe↔O respectively.…”

Section: Ftir Spectroscopic Analysismentioning

confidence: 99%

Structural and Magnetic Properties of Ultrafine CoFe2O4 Nanoparticles

Rao¹,

Choudary²,

Rao

et al. 2015

Procedia Materials Science

105

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Nanosized Cobalt ferrite (CoFe2O4) particles are prepared through the sol-gel method using polyvinyl alcohol (PVA) as a chelating agent. The powder as prepared is annealed at three different temperatures (400 o C, 500 o C and 1000 o C) for one hour. The X-ray diffraction patterns confirm the spinel structure of the samples. The XRD patterns of the samples indicate broad peaks and the full width at half maximum decreased with increasing annealing temperature. Infrared (IR) spectra of the samples confirm the presence of metal -oxygen complexes within the spinel lattice. The average particle size obtained from TEM micrographs demonstrates ultrafine particles having spherical morphology. The particle size of the annealed samples is in between 4.5-6.8 nm. The saturation magnetization (Ms) and remnant magnetization (Mr) of the samples show dependence on particle size and crystallinity of the samples. The highest saturation magnetization (78.1 emu/g) is achieved for the sample annealed at 1000 0 C having average particle size of 6.8 nm. The high saturation magnetization of the samples suggests the present method is suitable for obtaining nanocrystalline magnetic ferrites which is desirable for practical applications.

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Section: Ftir Spectroscopic Analysismentioning

confidence: 99%

Structural and Magnetic Properties of Ultrafine CoFe2O4 Nanoparticles

Rao¹,

Choudary²,

Rao

et al. 2015

Procedia Materials Science

105

View full text Add to dashboard Cite

show abstract

“…The tetrahedral site bands are shifted from lower band values to higher band values, i.e., from 574.32 to 579.21 cm -1 , which is attributed to the stretching of Fe-O bonds on substitution of Al ions. The octahedral band sites on the contrary shift towards lower frequency region from 429.24 to 417.51 cm -1 with Al addition, which is attributed to the shifting of Fe towards oxygen ion on occupation of octahedral sites by Al ions [37]. …”

Section: Resultsmentioning

confidence: 99%

Microstructural and Mössbauer properties of low temperature synthesized Ni-Cd-Al ferrite nanoparticles

Batoo

2011

Nanoscale Res Lett

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We report the influence of Al3+ doping on the microstructural and Mössbauer properties of ferrite nanoparticles of basic composition Ni0.2Cd0.3Fe2.5 - xAlxO4 (0.0 ≤ x ≤ 0.5) prepared through simple sol-gel method. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray, transmission electron microscopy (TEM), Fourier transformation infrared (FTIR), and Mössbauer spectroscopy techniques were used to investigate the structural, chemical, and Mössbauer properties of the grown nanoparticles. XRD results confirm that all the samples are single-phase cubic spinel in structure excluding the presence of any secondary phase corresponding to any structure. SEM micrographs show the synthesized nanoparticles are agglomerated but spherical in shape. The average crystallite size of the grown nanoparticles was calculated through Scherrer formula and confirmed by TEM and was found between 2 and 8 nm (± 1). FTIR results show the presence of two vibrational bands corresponding to tetrahedral and octahedral sites. Mössbauer spectroscopy shows that all the samples exhibit superparamagnetism, and the quadrupole interaction increases with the substitution of Al3+ ions.

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“…The pure oxides of CoO, ZnO, Fe 2 O 3 and Mn 2 O 3 were mixed together to take the required chemical formula [7][8][9] Co 0.6 Zn 0.4 Mn x Fe 2-x O 4 (x=0. 7, 0.8, 0.9 and 1) using an agate mortar for ten hours.…”

Section: Methodsmentioning

confidence: 99%

Effect of Gamma Irradiation on the Structure Diffusion Coefficient of Co-Zn Doped Ferrite

Hemeda¹

2005

American J. of Applied Sciences

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A series of the ferrite system Co_0.6Zn_0.4Mn_xFe_2-xO₄ with (x = 0.7, 0.8, 0.9 and 1) were prepared by general ceramic method. The X-ray diffraction patterns confirmed the formation of the cubic single phase structure. The lattice parameter and the crystal size increased after irradiation which was attributed to the formation of ferrous ions of larger radius than that of ferrous ions in unirradiated samples. A small shift was observed in the diffraction peak position. This indicated the slight distortion of the cubic structure. The diffusion coefficient of electrons was found to be increased for the irradiated samples. The concentration of electrons was estimated and was found to be increased after Î³-irradiation

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IR spectral studies of Co0.6Zn0.4MnxFe2−xO4 ferrites

Cited by 37 publications

References 21 publications

Structural and Magnetic Properties of Ultrafine CoFe2O4 Nanoparticles

Structural and Magnetic Properties of Ultrafine CoFe2O4 Nanoparticles

Microstructural and Mössbauer properties of low temperature synthesized Ni-Cd-Al ferrite nanoparticles

Effect of Gamma Irradiation on the Structure Diffusion Coefficient of Co-Zn Doped Ferrite

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