Low temperature synthesis and influence of rare earth Nd3+ substitution on the structural, magnetic behaviour of M-type barium hexa ferrite nanomaterials

Satyapal, Harendra Kumar; Singh, Rakesh Kumar; Kumar, Nishant; Sharma, Saurabh Kumar

doi:10.1016/j.matpr.2020.01.590

Cited by 14 publications

(5 citation statements)

References 36 publications

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“…The Himani Joshi et al have been synthesized BaFe 12 O 19 using the sol-gel auto-combustion technique, and they found the crystallite size of 45.35 nm using Debye-Scherrer's formula [31]. It was observed that increasing the doping concentration of La 3+ leads to a systematic decrease in the crystallite size, which strongly followed a similar trend as reported by H K Satyapal et al, where the crystallite size was found in the range of 82.9-64.9 nm with Nd 3+ substitution [32].…”

Section: Resultssupporting

confidence: 70%

Optimization of the structural, optical, and magnetic properties of sol-gel derived La³⁺ substituted nanostructured barium hexaferrites

et al. 2023

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The M-type barium hexaferrite has been considered an impeding material for their use as microwave absorbers and storage devices. In present investigation, the La3+ substituted M-type BaFe12-xLaxO19, (where x = 0, 0.2, 0.4, 0.6, 0.8, 1) was prepared via a facile sol-gel process at 850oC for 3 h. XRD confirmed the hexagonal crystal structure of La3+ substituted BaFe12O19 belonging to P63/mmc space group with the crystallite size in the range of 23.08-39.59 nm, which decreased with the increase in La3+ content. The Rietveld refinements displayed better goodness of fit (χ2) was observed between 1.20-1.90 for proper peak fitting. The W-H plot indicated the decrease in lattice strain (0.21×10-3-2.14×10-3) with the increase in La3+ contents. The SEM imaging revealed the agglomerations and estimated the average grain size in the range of 0.42-3.69 µm. FTIR spectroscopy confirmed the bands in the range of 432-622 cm-1, which represents stretching and bending vibrations of metal-oxygen bonds. The tetrahedral site exhibited a higher force constant and lower bond length than the octahedral site in M-type barium hexaferrite. The photoluminescence spectroscopy demonstrated that a prominent peak of La3+ substituted BaFe12O19 near 481 nm, which falls under the visible range with strong blue emission and indicates the radiative defects present in the crystal. At room temperature, the magnetic measurements indicate that the coercivity (Hc) increased, but the saturation magnetization (Ms) and the retentivity (Mr) decreased with the increase in La3+ substitutions. The anisotropy constant (K) and Bohr magnetron number (nB) were also evaluated between 0.932×106-1.109×106 erg/cm3 and 10.28-11.68 µB, respectively. Hence, the unique photoluminescence and magnetic properties may be responsible for its application in the electronic industry, telecommunication, microwave engineering and storage devices etc.

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Section: Resultssupporting

confidence: 70%

Optimization of the structural, optical, and magnetic properties of sol-gel derived La³⁺ substituted nanostructured barium hexaferrites

et al. 2023

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“…This may be because of the difference in the magnetic moment value of Co 2+ (3.7μ B ) [21] and Mn 3+ (4 μ B ) [47] ions with respect to Fe 3+ ion (5 μ B ) [21]. Similar observations of both increasing and decreasing M s and M r have been documented in other research investigations following substitution [13,38,41,48]. In order to properly comprehend and regulate the magnetic characteristics of the material, the effect of ion substitution on the magnetic properties of hexaferrites needs to be carefully taken into account and investigated on a case-by-case basis.…”

Section: Magnetic Analysissupporting

confidence: 83%

“…This offers opportunities to create cutting-edge materials with better functionality and performance. The structural and magnetic properties of BaFe 12 O 19 are affected by a number of factors, including the placement of the Fe 3+ ions within the crystal geometry, the annealing temperature, substituted elements, and the synthesis process [2,[12][13][14][15]. Exchange interactions, magnetic anisotropy, and the material's general magnetization behavior are all affected by the individual places that Fe 3+ ions occupy.…”

Section: Introductionmentioning

confidence: 99%

Enhancing structural and magnetic properties of BaFe₁₂O₁₉ nanoparticles through co-substitution (Co-Mn): A promising approach for permanent magnet applications

Moatoshi,

Sarma,

Borah

2023

Phys. Scr.

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In-depth study into the creation and improvement of rare-earth free permanent magnets, particularly ferrites, has been sparked by recent economic and environmental concerns. M-type barium hexaferrites (BaFe12O19, pure BHF) are a class of low-cost permanent magnets with an excellent curie temperature and good resistance to oxidation and corrosion that are significant from a technological perspective. In the current study, the experimental conditions are optimized to obtain barium hexaferrite (BaFe12O19) co-substituted with transition elements (Co and Mn) (BaFe12-2xCoxMnxO19) via the chemical co-precipitation method. In this framework, different substitution possibilities will be investigated. The structure, morphology, vibrational spectrum, and thermal stability of the generated nanoparticles were revealed using powder X-ray diffraction (XRD), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). Rietveld refinement was used to estimate the average bond length and bond angle in order to determine the impact of superexchange interaction. Based on more precise structural characteristics, the atomic occupation and distribution of bonds are depicted from their charge density graph. For all the synthesized materials, the maximum energy product (BH)max and magnetic characteristics (VSM) were also investigated. The potential causes of this phenomenon were examined and discussed at length.

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“…Moreover, for S q values, all complex samples are lower than 0.50, generally, this is the evidence of the existence of multi‐domain structure formation. [ 80 ]…”

Section: Resultsmentioning

confidence: 99%

The Ordered Mesoporous Barium Ferrite Compounded with Nitrogen‐Doped Reduced Graphene Oxide for Microwave Absorption Materials

Zhao

Cao

et al. 2023

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Nanocomposites with hierarchical pore structure hold great potentials for applications in the field of microwave‐absorbing materials because of their lightweight and high‐efficiency absorption properties. Herein, M‐type barium ferrite (BaM) with ordered mesoporous structure (M‐BaM) is prepared via a sol–gel process enhanced by mixed anionic and cationic surfactants. The surface area of M‐BaM is enhanced almost ten times compared with BaM together with 40% reflection loss enhancing. Then M‐BaM compounded with nitrogen‐doped reduced graphene oxide (MBG) is synthesized via hydrothermal reaction in which the reduction and nitrogen doping of graphene oxide (GO) in situ occur simultaneously. Interestingly, the mesoporous structure is able to provide opportunity for reductant to enter the bulk M‐BaM reducing its Fe3+ to Fe2+ and further forms Fe3O4. It requires an optimal balance among the remained mesopores in MBG, formed Fe3O4, and CN in nitrogen‐doped graphene (N‐RGO) for optimizing impedance matching and greatly increasing multiple reflections/interfacial polarization. MBG‐2 (GO:M‐BaM = 1:10) achieves the minimum reflection loss of −62.6 dB with an effective bandwidth of 4.2 GHz at an ultra‐thin thickness of 1.4 mm. In addition, the marriage of mesoporous structure of M‐BaM and light mass of graphene reduces the density of MBG.

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Low temperature synthesis and influence of rare earth Nd3+ substitution on the structural, magnetic behaviour of M-type barium hexa ferrite nanomaterials

Cited by 14 publications

References 36 publications

Optimization of the structural, optical, and magnetic properties of sol-gel derived La³⁺ substituted nanostructured barium hexaferrites

Optimization of the structural, optical, and magnetic properties of sol-gel derived La³⁺ substituted nanostructured barium hexaferrites

Enhancing structural and magnetic properties of BaFe₁₂O₁₉ nanoparticles through co-substitution (Co-Mn): A promising approach for permanent magnet applications

The Ordered Mesoporous Barium Ferrite Compounded with Nitrogen‐Doped Reduced Graphene Oxide for Microwave Absorption Materials

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Low temperature synthesis and influence of rare earth Nd3+ substitution on the structural, magnetic behaviour of M-type barium hexa ferrite nanomaterials

Cited by 14 publications

References 36 publications

Optimization of the structural, optical, and magnetic properties of sol-gel derived La3+ substituted nanostructured barium hexaferrites

Optimization of the structural, optical, and magnetic properties of sol-gel derived La3+ substituted nanostructured barium hexaferrites

Enhancing structural and magnetic properties of BaFe12O19 nanoparticles through co-substitution (Co-Mn): A promising approach for permanent magnet applications

The Ordered Mesoporous Barium Ferrite Compounded with Nitrogen‐Doped Reduced Graphene Oxide for Microwave Absorption Materials

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Optimization of the structural, optical, and magnetic properties of sol-gel derived La³⁺ substituted nanostructured barium hexaferrites

Optimization of the structural, optical, and magnetic properties of sol-gel derived La³⁺ substituted nanostructured barium hexaferrites

Enhancing structural and magnetic properties of BaFe₁₂O₁₉ nanoparticles through co-substitution (Co-Mn): A promising approach for permanent magnet applications