Ca2+ and Mg2+ incorporated barium hexaferrites: structural and magnetic properties

Almessiere, M.A.; Sayed, H.S. El; Baykal, A.

doi:10.1007/s10971-018-4853-1

Cited by 53 publications

(4 citation statements)

References 36 publications

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“…In recent years, hexagonal magnetic nanoparticles have attracted great scientific interest due to their potential for various technological applications like permanent magnets, microwave absorbers, high-density magnetic media, magneto-optic recording media, stealth technology [1][2][3][4]. Hexagonal ferrites are divided into five sub-categories based on their crystal structure and chemical formula: M-type (AFe 12 O 19 ), W-type (AFe 16 O 27 ), X-type (AFe 28 O 46 ), Y-type (AFe 12 O 22 ), Z-type (AFe 24 O 41 ), where A is the divalent cation like Ba 2+ , Sr 2+ , Pb 2+ , Ca 2+ [5][6][7]. Among these, M-type hexaferrite has gained more attention due to its distinguished properties like very high magnetic anisotropy, higher coercivity, higher corrosion resistance, high thermal and chemical stability [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4] Hexagonal ferrites are divided into five sub-categories based on their crystal structure and chemical formula: M-type (AFe 12 O 19 ), W-type (AFe 16 O 27 ), X-type (AFe 28 O 46 ), Y-type (AFe 12 O 22 ), and Z-type (AFe 24 O 41 ), where A is the divalent cation such as Ba 2+ , Sr 2+ , Pb 2+ , Ca 2+ . [5][6][7] Among these, M-type hexaferrites have gained more attention due to their distinguished properties, such as their very high magnetic anisotropy, higher coercivity, higher corrosion resistance, and high thermal and chemical stability. [8][9][10][11] Barium M-type (BaM) hexaferrites are ferrimagnetic materials with the chemical formula BaFe 12 O 19 and the space group P6 3 /mmc.…”

Section: Introductionmentioning

confidence: 99%

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Tailoring the optical and magnetic properties of La-BaM hexaferrites by Ni substitution

et al. 2022

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We investigate the impact of Ni insertion on the structural, optical, and magnetic properties of Ba0.8La0.2Fe12–x Ni x O19 hexaferrites (Ni substituted La-BaM hexaferrites). Samples were prepared using the conventional co-precipitation method and sintered at 1000 °C for 4 hours to assist the crystallization process. An analysis of the structure of the samples was carried out using an x-ray diffraction (XRD) spectrometer. The M-type hexagonal structure of all the samples was confirmed using XRD spectra. The lattice parameters a and c were found to be in the ranges of 5.8925±0.001 nm–5.8952±0.001 nm and 23.2123±0.001 nm–23.2219±0.001 nm, respectively. The M-type hexagonal nature of the prepared samples was also indicated by the presence of corresponding FT-IR bands and Raman modes in the FT-IR and Raman spectra, respectively. EDX results confirmed the successful synthesis of the samples according to the required stoichiometric ratio. A UV-vis spectrometer was used to record the absorption spectra of the prepared samples in the wavelength range of 200 nm–1100 nm. The optical energy bandgap of the samples was found to be in the range of 1.21 eV–3.39 eV. The M–H loops of the samples were measured at room temperature at an applied magnetic field range of 0 kOe–60 kOe. A high saturation magnetization of 99.92 emu/g was recorded in the sample with x = 0 at a microwave operating frequency of 22.2 GHz. This high value of saturation magnetization is due to the substitution of La3+ ions at the spin-up (12k, 2a, and 2b) sites. The Ni substitution is proven to be a potential candidate for the tuning of the optical and magnetic parameters of M-type hexaferrites. Therefore, we suggest that the prepared samples are suitable for use in magneto-optic applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tailoring the optical and magnetic properties of La-BaM hexaferrites by Ni substitution

et al. 2022

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“…The decrease in magnetization could be also attributed to the formation of secondary phases of Fe 2 O 3 , as observed in the XRD investigation. The variations in magnetization could be justified based on the dissimilarity in ionic radii of Fe 3+ (0.645 Å), Tm 3+ (0.88 Å), and Sm 3+ (0.958 Å) ions that generates local strains in the hexaferrite system, which in turn produces disorders and variations in the local electronic states [37,38].…”

Section: Magnetic Investigationsmentioning

confidence: 99%

“…However, SQR values at 10 K are below 0.5, and these products show multi-magnetic domain regions at low temperature. The effective anisotropy constant (K eff ) with respect to Tm-Sm and elaboration techniques (Figure 8) are deduced as follows [37]:…”

Section: Magnetic Investigationsmentioning

confidence: 99%

Impacts of Sol-Gel Auto-Combustion and Ultrasonication Approaches on Structural, Magnetic, and Optical Properties of Sm-Tm Co-Substituted Sr0.5Ba0.5Fe12O19 Nanohexaferrites: Comparative Study

et al. 2020

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In this paper, we introduced a comparative study of Sm-Tm-substituted Sr-Ba nanohexaferrites (NHFs), Sr0.5Ba0.5TmxSmxFe12−2xO19 with x = 0.00–0.05, manufactured via both citrate sol-gel auto-combustion and ultrasonication approaches. The phase formation of M-type hexaferrite (HF) for both compositions was confirmed by X-ray diffraction (XRD) powder pattern, Fourier-transform infrared (FT-IR) spectra, scanning and transmission electron microscopy (SEM and TEM) micrographs, energy dispersive X-ray (EDX) spectra, and elemental mappings. The magnetic properties at room temperature (RT) and low temperature (T = 10 K) were also investigated. M-H loops revealed ferrimagnetic nature for various prepared nanohexaferrites via sol-gel and ultrasonication routes. The Ms (saturation magnetization) and Mr (remanence) values increased with increasing Tm-Sm substituting contents. Ms and Mr reached their maximum values at x = 0.04 in the case of samples prepared using the sol-gel technique and at x = 0.03 for those prepared via ultrasonication route. M-H loops were very broad in samples prepared via ultrasonication route in comparison to those produced by means of the sol-gel approach, implying that the products synthesized via ultrasonication route have greater values of coercivity (Hc). The variations in Hc values with respect to Tm-Sm substitutions were governed by the evolutions in the magneto-crystalline anisotropy. Diffuse reflectance spectra (DRS) were employed to estimate the direct band gap of pristine and co-substituted Sr0.5Ba0.5Fe12O19 hexaferrites. Optical energy band gaps (Eg) of pristine samples were significantly tuned by co-substitution of Tm3+ and Sm3+ ions. Eg values of the Sr0.5Ba0.5Fe12O19 sample, which was synthesized using the sol-gel method, decreased almost linearly from 1.75 to 1.45 eV by increasing co-doped ion content. However, we observed a sharp drop from 1.85 eV to an average of 1.50 eV for the samples, which were synthesized using the ultrasonication approach.

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Magnetic Characterization of Nanomaterials

Slimani

Güner

Almessiere

et al. 2022

Synthesis and Applications of Nanoparticles

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Ca2+ and Mg2+ incorporated barium hexaferrites: structural and magnetic properties

Cited by 53 publications

References 36 publications

Tailoring the optical and magnetic properties of La-BaM hexaferrites by Ni substitution

Tailoring the optical and magnetic properties of La-BaM hexaferrites by Ni substitution

Impacts of Sol-Gel Auto-Combustion and Ultrasonication Approaches on Structural, Magnetic, and Optical Properties of Sm-Tm Co-Substituted Sr0.5Ba0.5Fe12O19 Nanohexaferrites: Comparative Study

Magnetic Characterization of Nanomaterials

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