Influence of Co4+-Ca2+ substitution on structural, microstructure, magnetic, electrical and impedance characteristics of M-type barium–strontium hexagonal ferrites

Patel, Charmi D.; Dhruv, Preksha N.; Meena, Sher Singh; Singh, Charanjeet; Kavita, S.; Ellouze, M.; Jotania, Rajshree B.

doi:10.1016/j.ceramint.2020.05.326

Cited by 53 publications

(15 citation statements)

References 77 publications

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“…The increase in lattice parameters and lattice volume in La 3+ ion substitution as compared to Ni 2+ ion substitution was due to the differences in ionic radii of Ni 2+ and La 3+ ions [24,25]. For M-type structure, the c/a ratio is approximately 3.98, but in our study, this ratio varied from 3.79 to 3.89, which implies that some distortion occurred in the crystal lattice after La and Ni substitution in prepared calcium hexaferrites [27,28]. The X-ray density (ρ m ) was observed to be smaller in Ni substitution as compared to La substitution.…”

Section: Resultscontrasting

confidence: 56%

Comparative study of structural and magnetic properties of Ni and La substituted calcium hexaferrite

Shinde¹,

Dahotre

2021

Cerâmica

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Ni and La substituted M-type Ca hexaferrite of composition CaNi 1 Fe 11 O 19 and CaLa 1 Fe 11 O 19 were synthesized by sol-gel auto combustion method using metal nitrates as oxidants and citric acid as reducing agent. The prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), energy dispersive X-ray analysis (EDAX), and vibrating sample magnetometry (VSM). XRD study revealed that both samples had lattice parameters a and c within the range of M-type hexaferrite. The SEM micrographs displayed grains having irregular shapes and sizes in the nanometer range. FTIR peaks confirmed the structure of M-type hexaferrite. EDAX spectra showed the homogeneous distribution of ions in both samples. In CaNi 1 Fe 11 O 19 , we found saturation magnetization (M s ) of 12.18 emu/g and coercivity (H c ) of 193.2 Oe. On the other hand, in CaLa 1 Fe 11 O 19 , we found M s of 0.55 emu/g and H c of 404.4 Oe. Saturation magnetization and coercivity values obtained for La substituted M-type Ca hexaferrite are suitable for low-density magnetic recording devices.

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Section: Resultscontrasting

confidence: 56%

Comparative study of structural and magnetic properties of Ni and La substituted calcium hexaferrite

Shinde¹,

Dahotre

2021

Cerâmica

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“…Using the formula below, the magnetic-moment per formula unit can be found in the form of Bohr's magnetron [40,51].…”

Section: Magnetic Examinationmentioning

confidence: 99%

Microstructural, morphological and magnetic behaviour of Al³⁺ replaced BaFe_11.5Co_0.5O₁₉ hexaferrites synthesized via sol-gel auto combustion route

Ijaz,

Asif,

Solre

et al. 2024

Phys. Scr.

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In this work, polycrystalline BaFe11.5-xAlxCo0.5O19 (0≤x≤2) hexaferrite samples were synthesised by means of the sol-gel technique. Thereafter, the magnetic and structural properties are thoroughly examined. Cell refinement and XRD examination verified a magnetoplumbite hexaferrite arrangement with a space group of P63/mmc for each sample. The parameters 'a' and 'c' in the lattice fall in value from 5.885 Å to 5.875 Å and from 23.117 Å to 23.049 Å, respectively. Both the average crystallite size and the unit cell volume exhibit a declining trend as the doping level increases. For M-type hexaferrites, the optimal range of c/a values is determined to be 3.923-3.928. The refining process quality was confirmed by the fit good-ness (χ2) values, which fall within the range of 1.079-1.094. X-ray density (dx) and bulk density (db) decline with rising doping contents until x=1.5 doping content, at which point they exhibit an increasing trend. The results showed that as the doping amount increased, the saturation and remanence magnetizations decreased. Coercivity and magnetocrystalline anisotropy are rising together. Both the anisotropy field (Ha) and the anisotropy parameter (B) exhibit a rising trend with doping content. Coercivity of 5.896 kOe, anisotropic applied field of 1.84 kOe, saturation magnetization of 42.68 emu/g, remanence magnetization of 24.414 (emu/g), and magnetic moment per formula unit-(mB) of 11.19µB are the best magnetic properties obtained for the BaFe10Al1.5Co0.5O19 sample.

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“…The electrical connections to the LCR meter were made using copper wires. The dielectric constant can be calculated by [44][45][46]…”

Section: Dielectric Studies Of Y-type Hexaferrites Ba 2 Co 2 Fe 12 O ...mentioning

confidence: 99%

The study of structural, magnetic, and microwave absorbing properties of graphene/hexagonal ferrite for microwave absorber

Sultan,

Murtaza,

Nazir

et al. 2023

Phys. Scr.

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This work reports the synthesis and characterization of Y-type Hexaferrite (Ba2Co2Fe12O22) and its composites with 20, 30, 40, and 50 wt% rGO. Ferrites were fabricated using the hydrothermal method and then sintered for 6 h at 1000 °C. The formation of Y-type hexaferrite (Ba2Co2Fe12O22) and Ferrites/rGO composites was confirmed using X-ray diffraction. Ferrite/rGO composites exhibited no diffraction peaks due to rGO, which may be due to staking disorders and uniformly dispersed graphene sheets. Scanning electron microscopy showed that graphene nanolayers are well-decorated with Y-type hexaferrite nanoparticles. FTIR spectra measured for Ba2Co2Fe12O22, rGO, and Ba2Co2Fe12O22/rGO nanocomposites revealed the presence of relevant functional chemical bonds. The dielectric properties studied between 1MHz-3GHz frequency range showed that composites of Ba2Co2Fe12O22/rGO perform better than pure ferrite. Diffuse reflectance spectroscopy was applied to determine the band gap, and rGO/Ferrites composites exhibited a band gap in the range of 4.4-4.6 eV. Vibrating sample magnetometer (VSM) measurements showed saturation magnetization of 26.2 emu/g in pure hexaferrite, which significantly lowered with rGO content in the composites. From enhanced absorption and reflection parameters of dielectric properties and magnetic loss that originate from the synergetic effect of rGO and Y-type hexaferrite (Ba2Co2Fe12O22), this study suggests lightweight, flexible, and efficient EMI shielding composites.

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Influence of Co4+-Ca2+ substitution on structural, microstructure, magnetic, electrical and impedance characteristics of M-type barium–strontium hexagonal ferrites

Cited by 53 publications

References 77 publications

Comparative study of structural and magnetic properties of Ni and La substituted calcium hexaferrite

Comparative study of structural and magnetic properties of Ni and La substituted calcium hexaferrite

Microstructural, morphological and magnetic behaviour of Al³⁺ replaced BaFe_11.5Co_0.5O₁₉ hexaferrites synthesized via sol-gel auto combustion route

The study of structural, magnetic, and microwave absorbing properties of graphene/hexagonal ferrite for microwave absorber

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Influence of Co4+-Ca2+ substitution on structural, microstructure, magnetic, electrical and impedance characteristics of M-type barium–strontium hexagonal ferrites

Cited by 53 publications

References 77 publications

Comparative study of structural and magnetic properties of Ni and La substituted calcium hexaferrite

Comparative study of structural and magnetic properties of Ni and La substituted calcium hexaferrite

Microstructural, morphological and magnetic behaviour of Al3+ replaced BaFe11.5Co0.5O19 hexaferrites synthesized via sol-gel auto combustion route

The study of structural, magnetic, and microwave absorbing properties of graphene/hexagonal ferrite for microwave absorber

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Microstructural, morphological and magnetic behaviour of Al³⁺ replaced BaFe_11.5Co_0.5O₁₉ hexaferrites synthesized via sol-gel auto combustion route