Role of Ce–Mn substitution on structural, electrical and magnetic properties of W-type strontium hexaferrites

Khan, Imran Mahmood; Sadiq, Imran; Ashiq, Muhammad Naeem; Rana, M.U.

doi:10.1016/j.jallcom.2011.05.013

Cited by 64 publications

(23 citation statements)

References 31 publications

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“…Various magnetic properties such as coercivity (H c ), saturation magnetization (M s ), and remanent magnetization (M r ) were measured for all samples and are listed in Table 3. It is evident that the value of saturation magnetization for the sample with x = 0.0 (SrCo 2 Fe 16 O 27 ) is much higher than the results of earlier reports for SrCo 2 -W hexaferrites synthesized by other methods [3,4]. With an increase in dopants' content, saturation magnetization decreases for all samples and reaches a minimum value at the dopant contents of x = 0.4.…”

Section: Magnetic Propertiesmentioning

confidence: 52%

“…Imran et al [4] have reported the value of coercivity, saturation magnetization, and remanence were enhanced with an increase in Ce-Mn concentration which suggests that the synthesized material can be employed for applications in perpendicular magnetic recording media.…”

Section: Introductionmentioning

confidence: 96%

“…Among various types of W-type Sr-ferrites, Co 2 -W has caught much more attention recently due to high values of permeability and magnetic loss properties [3]. Magnetic properties such as saturation magnetization, coercivity, and ferromagnetic resonant frequency can be effectively adjusted by controlling the composition, calcining temperature, and amount and type of substitution [4]. Several researches have reported the substitution of different ions in the SrCo 2 -W hexagonal structure to the enhancement of magnetic properties [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…Magnetic properties such as saturation magnetization, coercivity, and ferromagnetic resonant frequency can be effectively adjusted by controlling the composition, calcining temperature, and amount and type of substitution [4]. Several researches have reported the substitution of different ions in the SrCo 2 -W hexagonal structure to the enhancement of magnetic properties [2][3][4][5][6]. The attractive feature of the W-hexaferrites is that their magnetic properties can be varied in a wide range by a suitable choice of the substitutional divalent cations without changing the iron content [7].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effects of Divalent Ion Substitution on the Microstructure and Magnetic Properties of SrCo 2−x (MnZnCa) x/3Fe 1 6 O 2 7 Nanoparticles

Ghasemi

2016

J Supercond Nov Magn

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W-type hexaferrite nanoparticles with a composition of SrCo 2−x (MnZnCa) x/3 Fe 16 O 27 (x = 0-0.5) were synthesized by a chemical co-precipitation method. The effect of substitution of Mn, Zn, and Ca cations on the structural and magnetic properties of nanoparticles was characterized by X-ray diffraction (XRD), Fourier transformed infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDX), and vibrating sample magnetometer (VSM). The XRD patterns confirmed the existence of hexagonal W-type single phase ferrite. According to the SEM micrographs, it was found that the particle size lies in the range of 40-60 nm, with an irregular configuration. The elemental composition estimated from the EDX analysis was in good agreement with the nominal composition. Hysteresis loops for all samples were measured at a room temperature up to a maximum applied field of 10 kOe. The results revealed that with an increase in substitutional cation contents, the values of saturation magnetization and coercivity decreased from 78.4 to 70.8 emu/g and the values of coercivity also decreases from 1350 to 940 Oe. Correlation between structural and magnetic analyses was also earned out.

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Section: Magnetic Propertiesmentioning

confidence: 52%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of Divalent Ion Substitution on the Microstructure and Magnetic Properties of SrCo 2−x (MnZnCa) x/3Fe 1 6 O 2 7 Nanoparticles

Ghasemi

2016

J Supercond Nov Magn

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“…XRD data were used to calculate cell constants, crystallite sizes (D), and cell volume (V), by use of equations reported elsewhere. 21,22 The lattice/cell constants a and c were calculated by solving the simultaneous equations for different diffraction peaks, by using the equation…”

Section: Resultsmentioning

confidence: 99%

Structural, Magnetic, and Microwave-Absorption Properties of Nanocrystalline Ca(MnSn) x Fe12−2x O19 Ferrites

Ali-Sharbati

Amiri

Mousarezaei

2014

Journal of Elec Materi

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Nanoparticles of Ca(MnSn) x Fe 12À2x O 19 with x ranging from 0.00 to 0.6 in steps of 0.2 were prepared by use of the citrate precursor method. The structural, microwave-absorption, and magnetic properties of these ferrites were determined by use of different characterization techniques. The morphology of the ferrite powders was investigated by transmission electron microscopy (TEM). X-ray diffraction (XRD) was used for structural and micro-structural studies, and revealed that the samples had an M-type hexagonal structure. The crystallite size for each sample was calculated by use of the Scherrer formula for the most intense peak (411) and the results were compared with those obtained from TEM images of the samples. The particle size of the powder varied from 60 to 36 nm. Magnetic measurements were performed by vibrating sample magnetometry (VSM) at room temperature. The microwaveabsorption properties of ferrite (70 wt.%)-polymer (30 wt.%) composites 2 mm thick were investigated by vector network analysis (VNA) in the frequency range 12-20 GHz. The ferrite for which x = 0.4 had a minimum reflection loss of À29 dB at 17.3 GHz with a À15 dB bandwidth over the extended frequency ranges 12.9-14.5 GHz and 16.7-18 GHz. The minimum loss reached À32 dB at frequency of 17 GHz when the total amount of Mn 2+ and Sn 4+ ions was 0.6. These results suggest that the synthesized magnetic composites can be used as effective microwave absorbers in military applications (radar cross-section reduction).

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Electromagnetic Interference Shielding Properties of BaCo₂Fe₁₆O₂₇ Nanoplatelets and RGO Reinforced PVDF Polymer Composite Flexible Films

Ананд

Pauline

2020

Adv Materials Inter

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The electromagnetic Interference (EMI) shielding effectiveness of W‐Type barium hexaferrite (BaCo2Fe16O27) and reduced graphene oxide (RGO) nanofillers reinforced poly(vinylidenefluoride) (PVDF) polymer composite films are reported. Two different amounts of BaCo2Fe16O27 (10 wt% and 30 wt%) nanofillers and fixed amount of RGO (10 wt%) are loaded in PVDF matrix by solvent casting in order to fabricate the multifunctional PVDF/RGO/BaCo2Fe16O27 composite films. The synthesized samples are investigated using various instruments including X‐ray diffraction (XRD), Fourier‐transform infrared spectroscopy (FTIR), Raman spectroscopy, high resolution scanning electron microscopy (HRSEM), energy dispersive X‐ray spectroscopy (EDX), X‐ray photoelectron spectroscopy (XPS) and vibrating sample magnetometer (VSM) analysis. The microwave properties of PVDF/RGO/BaCo2Fe16O27 composites are tested with vector network analyser (VNA) in 8–12 GHz frequency (X‐Band). The possible mechanism of EMI shielding is investigated from the analysis of complex permittivity and permeability.The resultant flexible films exhibit desirable EMI SE of 35.94 dB at 11.8 GHz for the 10 wt% of BaCo2Fe16O27 addition in PVDF composite for a very small thickness of 0.2 mm. The combination of high dielectric loss ( tanδε = 1.63) and magnetic loss (tanδμ = 0.26) contributes to high absorption of 29.85 dB (>99% attenuation) dominated over reflection. Thus, the simple and cost‐effective fabrication of ultrathin and flexible PVDF/RGO/BaCo2Fe16O27 composite film with low filler content has a great potential as suppresser in electromagnetic fields.

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Role of Ce–Mn substitution on structural, electrical and magnetic properties of W-type strontium hexaferrites

Cited by 64 publications

References 31 publications

Effects of Divalent Ion Substitution on the Microstructure and Magnetic Properties of SrCo 2−x (MnZnCa) x/3Fe 1 6 O 2 7 Nanoparticles

Effects of Divalent Ion Substitution on the Microstructure and Magnetic Properties of SrCo 2−x (MnZnCa) x/3Fe 1 6 O 2 7 Nanoparticles

Structural, Magnetic, and Microwave-Absorption Properties of Nanocrystalline Ca(MnSn) x Fe12−2x O19 Ferrites

Electromagnetic Interference Shielding Properties of BaCo₂Fe₁₆O₂₇ Nanoplatelets and RGO Reinforced PVDF Polymer Composite Flexible Films

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Role of Ce–Mn substitution on structural, electrical and magnetic properties of W-type strontium hexaferrites

Cited by 64 publications

References 31 publications

Effects of Divalent Ion Substitution on the Microstructure and Magnetic Properties of SrCo 2−x (MnZnCa) x/3Fe 1 6 O 2 7 Nanoparticles

Effects of Divalent Ion Substitution on the Microstructure and Magnetic Properties of SrCo 2−x (MnZnCa) x/3Fe 1 6 O 2 7 Nanoparticles

Structural, Magnetic, and Microwave-Absorption Properties of Nanocrystalline Ca(MnSn) x Fe12−2x O19 Ferrites

Electromagnetic Interference Shielding Properties of BaCo2Fe16O27 Nanoplatelets and RGO Reinforced PVDF Polymer Composite Flexible Films

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Product

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Electromagnetic Interference Shielding Properties of BaCo₂Fe₁₆O₂₇ Nanoplatelets and RGO Reinforced PVDF Polymer Composite Flexible Films