Characterization of magnetic and microwave absorption properties of multi-walled carbon nanotubes/Mn-Cu-Zr substituted strontium hexaferrite nanocomposites

Rostami, Mostafa; Moradi, Mahmood; Alam, Reza Shams; Mardani, Reza

doi:10.1016/j.materresbull.2016.06.019

Cited by 33 publications

(5 citation statements)

References 31 publications

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“…Absorption band at 2,925 and 2,859 cm −1 relates to C-H stretching vibration with symmetrical and asymmetrical stretching vibrations of CO 2− group at 1617 cm −1 . Observed peaks for all the samples in the range of 1,100-1,500 cm −1 correspond to metal-oxygen-metal (Fe-O-Fe) bonds [65].…”

Section: Transmission Electron Microscopementioning

confidence: 97%

Influence of High Temperature on the Crystal Structure of SrFe₁₂O₁₉ Nanoparticle

Saeed

Azhdar

2022

Journal of Nanomaterials

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In this study, strontium hexaferrite nanoparticles synthesized by sol–gel autocombustion method and the effect of high annealing temperature on produced nanoparticle have been studied. Powders were annealed at 1,000 and 1,300°C. Structural properties of synthesized powders were analyzed by X-ray diffraction (XRD). Hexagonal structure and shape of SrFe12O19 nanoparticles were analyzed from field-emission scanning electron microscope and transmission electron microscope figures. Fourier-transform infrared spectroscopy confirmed the formation of an M-type hexagonal structure. The thermal behavior of nanoparticles has been investigated by thermogravimetric analysis (TGA and DTG). Height measurement of nanoparticles with 2D and 3D images of the surface obtained from atomic force microscopy. XRD pattern of strontium hexaferrite nanoparticle was used for determining the crystal structure and examining the effect of high annealing temperature on powders by finding lattice parameters, densities, crystallite size, specific surface area, and strain. Crystallite size, strain, and bulk density decreased when produced nanoparticles annealed at 1,000°C with decreased porosity when nanoparticles were annealed at 1,300°C. The specific surface area was found to be increased when nanoparticles were annealed at 1,000°C. In this study, influence of high temperature on the structure of SrFe12O19 nanoparticles was studied.

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Section: Transmission Electron Microscopementioning

confidence: 97%

Influence of High Temperature on the Crystal Structure of SrFe₁₂O₁₉ Nanoparticle

Saeed

Azhdar

2022

Journal of Nanomaterials

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“…The absorption bands in the range 1100 cm −1 to 1500 cm −1 observed in all the samples could be attributed to metal-oxygen-metal (M-O-M) bonds such as Fe-O-Fe bonds; broad absorption band observed at 3459 cm −1 as a result of -OH stretching vibration could be due to the presence of water molecules absorbed by the samples. [28] The observed absorption band at 1649 cm −1 results from H-O-H bending vibration of H 2 O. [29] Transmittance/arb.…”

Section: Ftir Analysismentioning

confidence: 99%

Enhanced dielectric and optical properties of nanoscale barium hexaferrites for optoelectronics and high frequency application

Mohammed

Suleiman²,

Carol

et al. 2018

Chinese Phys. B

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M-type barium hexaferrites with chemical composition Ba 1−x Dy x Fe 12−y Cr y O 19 (x = 0.0, 0.1, 0.2, and y = 0.0, 0.4, 0.5) were synthesized via sol-gel auto-combustion method. The samples were pre-sintered at 400 • C for 3 h and sintered at 950 • C for 5 h. The changes in the structural, dielectric, and optical properties were studied after the substitution of Dy 3+ and Cr 3+ ions. X-ray diffraction (XRD) analysis confirms the formation of single phase hexaferrites with the absence of secondary phase. FTIR analysis gives an idea of the formation of hexaferrites with the appearance of two peaks at 438 cm −1 and 589 cm −1 . The field emission scanning electron micrographs (FESEM) show a combination of crystallites with large shapes close to hexagonal platelet-like shape and others with rice or rod-like shapes, whereas EDX and elemental analysis confirm the stoichiometry of prepared samples. The calculated band gap from UV-vis NIR spectroscopy spectra was found to decreases with increase in Dy 3+ -Cr 3+ substitution. The dielectric properties were explained on the basis of Maxwell-Wagner model. Enhancement of dielectric constant at higher frequencies was observed in all the samples. Low dielectric loss is also observed in all the samples and Cole-Cole plot shows that grain boundary resistance (R gb ) contribute most to the dielectric properties. The prepared samples exhibit properties that could be useful for optoelectronics and high frequency application.

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“…Journal of Physics: Conference Series 2267 (2022) 012024 down and 4 spin up Fe 3+ ions get cancelled out resulting in a total magnetic moment of 4×5= 20 µB [3]. To achieve well defined microstructure, excellent magnetic, electric and microwave characteristics, a wide range of synthesis techniques are employed such as sol-gel [2], co-precipitation [9], hydrothermal synthesis [10], spray pyrolysis [5] and citrate precursor method [11]. Different synthesis conditions were found to yield different magnetic characteristics in materials under analysis [12].…”

Section: Rafas-2021mentioning

confidence: 99%

Yttrium doped strontium nano hexaferrites: Influence of yttrium on the structural and magnetic properties of sol-gel synthesized nanocrystalline strontium hexaferrite

Sharma¹,

Kumar

Gewali

et al. 2022

J. Phys.: Conf. Ser.

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Yttrium (Y3+)-substituted strontium hexaferrite nanoparticles with composition SrFe12-x Y x O19 have been synthesized using the sol-gel method. Diverse analytical tools have been applied to characterize the prepared strontium hexaferrite nanoparticles and to analyse the influence of yttrium (Y3+) substitution on the structural and magnetic properties. X-ray diffraction patterns confirm the presence of single phase M-type hexagonal crystalline structure. In fourier-transform infrared spectroscopy, the absorption bands at low wavenumber confirmed the formation of hexagonal ferrites. The vibrating sample magnetometer has been employed to study the magnetic behavior of Y3+ ions substituted strontium hexaferrite. The decrease in saturation magnetization (Ms) and coercivity (Hc) value has been explained on the basis of alteration in magnetic interactions due to the replacement of both Fe3+ ions by the non-magnetic Y3+ ions.

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Characterization of magnetic and microwave absorption properties of multi-walled carbon nanotubes/Mn-Cu-Zr substituted strontium hexaferrite nanocomposites

Cited by 33 publications

References 31 publications

Influence of High Temperature on the Crystal Structure of SrFe₁₂O₁₉ Nanoparticle

Influence of High Temperature on the Crystal Structure of SrFe₁₂O₁₉ Nanoparticle

Enhanced dielectric and optical properties of nanoscale barium hexaferrites for optoelectronics and high frequency application

Yttrium doped strontium nano hexaferrites: Influence of yttrium on the structural and magnetic properties of sol-gel synthesized nanocrystalline strontium hexaferrite

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Characterization of magnetic and microwave absorption properties of multi-walled carbon nanotubes/Mn-Cu-Zr substituted strontium hexaferrite nanocomposites

Cited by 33 publications

References 31 publications

Influence of High Temperature on the Crystal Structure of SrFe12O19 Nanoparticle

Influence of High Temperature on the Crystal Structure of SrFe12O19 Nanoparticle

Enhanced dielectric and optical properties of nanoscale barium hexaferrites for optoelectronics and high frequency application

Yttrium doped strontium nano hexaferrites: Influence of yttrium on the structural and magnetic properties of sol-gel synthesized nanocrystalline strontium hexaferrite

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Influence of High Temperature on the Crystal Structure of SrFe₁₂O₁₉ Nanoparticle

Influence of High Temperature on the Crystal Structure of SrFe₁₂O₁₉ Nanoparticle