Effect of La3+ cation solubility on the structural, magnetic and electrical properties of barium hexaferrite

Mariño-Castellanos, P.; Guerrero, F.; Romaguera-Barcelay, Y.; Goveia-Alcaide, E.; Cotta, Eduardo Adriano; Leyet, Y.; Anglada-Riveira, J.; Padrón-Hernández, E.; Peña-Garcia, R.

doi:10.1016/j.ceramint.2020.11.183

Cited by 25 publications

(4 citation statements)

References 65 publications

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“…The decrease in a , c , and V could be attributed to the substitution of a smaller ionic radius of La 3+ ( r La 3+ = 1.172 Å) for a larger one of Ba 2+ ( r Ba 2+ = 1.49 Å). 37 A similar phenomenon could be observed not only in the rare‐earth elements doped in the strontium Z‐type hexaferrite (Sr 3− x R x Co 2 Fe 24 O 41 ), 37 but also in the M‐type (Ba 1− x La x Fe 12 O 19 ) 38,39 and W‐type (Sr 1− x La x Co 2 Fe 16 O 27 ) 40 hexaferrites.…”

Section: Resultsmentioning

confidence: 75%

Enhanced microwave absorption features of Ba₃Co₂Fe₂₄O₄₁ hexaferrite by high lanthanium doping concentration

et al. 2022

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Controlling material structure and its electromagnetic properties, including complex permittivity and permeability, could enhance the microwave absorption performance of the material in terms of reflection loss and effective absorption bandwidth. In this study, La-substituted barium hexaferrite, Ba 3−x La x Co 2 Fe 24 O 41 (x = 0, 0.1, 0.3, and 0.5) compounds were successfully prepared using the solid-state reaction method, and their corresponding microstructures, static magnetic properties, and electromagnetic features in 2-18 GHz were investigated. The doping of La content increased saturation magnetization, coercivity, and remnant magnetization. The Ba 2.7 La 0.3 Co 2 Fe 24 O 41 epoxied sample with 3.5 mm thickness possessed an excellent microwave absorption of −47.3 dB at 3.52 GHz, and its corresponding effective absorption bandwidths were 3.75 GHz (2.25-6 GHz) and 0.57 . It is shown that doping with various La concentrations on Ba 3 Co 2 Fe 24 O 41 can be used as an effective technique to tune the performance of microwave absorbers based on barium hexaferrite.

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Section: Resultsmentioning

confidence: 75%

Enhanced microwave absorption features of Ba₃Co₂Fe₂₄O₄₁ hexaferrite by high lanthanium doping concentration

et al. 2022

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“…If the sample contains grains with different orientations, then some of the diffraction peaks may be suppressed, while others may be enhanced. In the case of La 3+ substituted barium hexaferrites, the secondary peaks of α-Fe 2 O 3 and LaFeO 3 may arise due to the formation of impurity phases [27]. The presence of secondary phases in the diffractograms may also be responsible for the development of lattice strains.…”

Section: Characterizationmentioning

confidence: 99%

“…This phenomenon might be because of secondary phases like α-Fe 2 O 3 and LaFeO 3 as well as the substitution of Fe 3+ (0.64) by La 3+ (1.06) at octahedral sites. P Marino-Castellanos et al examined the secondary phases and the insertion of La 3+ in the structure both have a significant impact on the magnetic characteristics [27]. As previously observed by Suthar et al, the substitution of La 3+ ions for Ba 2+ ions cause the introduction of Fe 2+ ions into the structure, which leads to a reduction in M s from 38.53 to 33.71 emu g −1 and an increase in coercivity (H c ) from 94.17 to 213.30 Oe [54].…”

Section: Magnetic Measurementmentioning

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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“…The inclusion of Sr caused a reduction in the values of the dielectric constant (both real as well as imaginary). Castellanos et al [16] reported a study on the effect of La 3+ on the structural and electric characteristics of barium hexaferrites. The doping of La 3+ reduced the resistivity, while it increased the permittivity as well as the ac conductivity of the samples.…”

Section: Introductionmentioning

confidence: 99%

Functionalization of morphology in optimization of dielectric, electrical/impedance modulus, and relaxation mechanisms of Co-Ni doped M-type Sr nanoferrites

Naqvi,

Singh,

Godara

et al. 2024

Phys. Scr.

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In this article, novel M-type hexaferrites SrCoxNixFe12-2xO19 were synthesized using the sol-gel method. The phase structure was characterized by X-ray diffraction, grain morphology was investigated from scanned electron micrographs, and dielectric/electric/impedance characteristics were analyzed in the frequency range of 100 Hz to 2 MHz. X-ray diffraction (XRD) revealed the formation of hexaferrites without any secondary phase. The grain size and distribution were significantly affected by Co-Ni dopants and there was an observation of cluster of grains, grain agglomerates, and improved inter-grain connectivity. The substitution of Co-Ni caused a reduction in crystallite size from 41.47 to 23.14 nm and the dielectric constant/loss tangent varied non-monotonically. The electric modulus indicated a non-Debye type relaxation and the charge transport mechanism exhibited conductivity relaxation to be more dominant than dielectric relaxation. The prepared ferrites show a large dielectric constant and hence are suitable for use in transformer core and storage media. The correlation of simulated grain/grain boundary parameters with morphology, dielectric parameter, and electric modulus has been presented.

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Effect of La3+ cation solubility on the structural, magnetic and electrical properties of barium hexaferrite

Cited by 25 publications

References 65 publications

Enhanced microwave absorption features of Ba₃Co₂Fe₂₄O₄₁ hexaferrite by high lanthanium doping concentration

Enhanced microwave absorption features of Ba₃Co₂Fe₂₄O₄₁ hexaferrite by high lanthanium doping concentration

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

Functionalization of morphology in optimization of dielectric, electrical/impedance modulus, and relaxation mechanisms of Co-Ni doped M-type Sr nanoferrites

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Effect of La3+ cation solubility on the structural, magnetic and electrical properties of barium hexaferrite

Cited by 25 publications

References 65 publications

Enhanced microwave absorption features of Ba3Co2Fe24O41 hexaferrite by high lanthanium doping concentration

Enhanced microwave absorption features of Ba3Co2Fe24O41 hexaferrite by high lanthanium doping concentration

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

Functionalization of morphology in optimization of dielectric, electrical/impedance modulus, and relaxation mechanisms of Co-Ni doped M-type Sr nanoferrites

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Enhanced microwave absorption features of Ba₃Co₂Fe₂₄O₄₁ hexaferrite by high lanthanium doping concentration

Enhanced microwave absorption features of Ba₃Co₂Fe₂₄O₄₁ hexaferrite by high lanthanium doping concentration

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