Investigations and Correlations of Structural, Magnetic, and Dielectric Properties of M-Type Barium Hexaferrite (BaFe12O19) for Hard Magnet Applications

Joshi, Himani; Kumar, A. Ruban

doi:10.1007/s10948-022-06203-x

Cited by 7 publications

(3 citation statements)

References 75 publications

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“…The average crystallite size of samples BL 0 to BL 5 was approximately found to be in the range of 23.08-39.59 nm. 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: Resultsmentioning

confidence: 99%

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: Resultsmentioning

confidence: 99%

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

et al. 2023

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“…Moreover, the magnetic properties of BFO were used to develop absorbents for the removal of various toxins from water [2]. BFO exhibits high magnetization and magnetic anisotropy, a high Curie temperature of 723 K, and a good maximum energy product value (BH max ) [3]. BFO shows superior magnetic hardness compared to other hexaferrites.…”

Section: Introductionmentioning

confidence: 99%

“…There is currently a surge of interest in the electrical properties of BFO. The deformation of FeO 6 octahedrons in the BFO magnetoplumbite structure and the off-center shift of Fe 3+ ions results in polarization, which can be enhanced by doping [3]. Pure and doped BFO showed multiferroic properties [7].…”

Section: Introductionmentioning

confidence: 99%

Charge Storage Properties of Ferrimagnetic BaFe12O19 and Polypyrrole–BaFe12O19 Composites

Chen,

Zhitomirsky

2024

Molecules

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This investigation is motivated by an interest in multiferroic BaFe12O19 (BFO), which combines advanced ferrimagnetic and ferroelectric properties at room temperature and exhibits interesting magnetoelectric phenomena. The ferroelectric charge storage properties of BFO are limited due to high coercivity, low dielectric constant, and high dielectric losses. We report the pseudocapacitive behavior of BFO, which allows superior charge storage compared to the ferroelectric charge storage mechanism. The BFO electrodes show a remarkably high capacitance of 1.34 F cm−2 in a neutral Na2SO4 electrolyte. The charging mechanism is discussed. The capacitive behavior is linked to the beneficial effect of high-energy ball milling (HEBM) and the use of an efficient dispersant, which facilitates charge transfer. Another approach is based on the use of conductive polypyrrole (PPy) for the fabrication of PPy-BFO composites. The choice of new polyaromatic dopants with a high charge-to-mass ratio plays a crucial role in achieving a high capacitance of 4.66 F cm−2 for pure PPy electrodes. The composite PPy-BFO (50/50) electrodes show a capacitance of 3.39 F cm−2, low impedance, reduced charge transfer resistance, enhanced capacitance retention at fast charging rates, and good cyclic stability due to the beneficial effect of advanced dopants, HEBM, and synergy of the contribution of PPy and BFO.

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Effect of Ni2+and Co2+ substitution on the characteristics of the strontium aluminum hexaferrite (SrAl2Fe10O19)

Joshi,

Ruban Kumar

2023

J Sol-Gel Sci Technol

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The nickel and cobalt substituted strontium aluminium hexaferrite Sr1-xNixAl2Fe10O19/Sr1-xCoxAl2Fe10O19 (x = 0.1, 0.2) were synthesized via the sol-gel auto-combustion technique using glycine fuel. The particles formed in hexagonal crystal structure with space group P63/mmc.The field-emission scanning microscopy was adopted for morphological analysis, and the images revealed the plate-like formation of the particles. X-ray photoelectron spectroscopy confirmed the presence and oxidation states of all the elements. The vibrating sample magnetometer studies were taken to determine saturation magnetization (Ms), coercivity (Hc), squareness ratio (Mr/Ms), and energy product (BHmax) values. The electric studies disclosed the presence of relaxations in the system, which was interpreted through Koop and Maxwell-Wagner's model.

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Investigations and Correlations of Structural, Magnetic, and Dielectric Properties of M-Type Barium Hexaferrite (BaFe12O19) for Hard Magnet Applications

Cited by 7 publications

References 75 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

Charge Storage Properties of Ferrimagnetic BaFe12O19 and Polypyrrole–BaFe12O19 Composites

Effect of Ni2+and Co2+ substitution on the characteristics of the strontium aluminum hexaferrite (SrAl2Fe10O19)

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Investigations and Correlations of Structural, Magnetic, and Dielectric Properties of M-Type Barium Hexaferrite (BaFe12O19) for Hard Magnet Applications

Cited by 7 publications

References 75 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

Charge Storage Properties of Ferrimagnetic BaFe12O19 and Polypyrrole–BaFe12O19 Composites

Effect of Ni2+and Co2+ substitution on the characteristics of the strontium aluminum hexaferrite (SrAl2Fe10O19)

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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