Abstract The citrate combustion technique was employed to synthesize barium hexaferrites represented by the formula BaFe 11.5 Y 0.5 O 19 , where Y denotes Zr, Zn, Ni, and Gd. XRD analysis confirms the hexagonal structure of these materials, which are classified under the space group P63/MMC-(No 194). The smallest crystallite size is observed in BaFe 11.5 Gd 0.5 O 19 , with measurements recorded at 36.968 nm according to the Halder-Wagner method. The band gap is calculated using the Tauc model. The introduction of dopant ions (Zr, Zn, Ni, and Gd) resulted in the establishment of electronic energy levels, which caused distortions in the sample and generated new locations for stabilizing charge carrier species within the samples. The BET plot shows H3 hysteresis with a type II isotherm, indicating that the inter-particle voids contribute to meso-porosity with an average pore diameter of 9.351 nm. The samples are applied in wastewater treatment, specifically serving as purifiers for lead-contaminated water. The impact of contact time is examined for all samples, revealing that BaFe 11.5 Zr 0.5 O 19 and BaFe 11.5 Gd 0.5 O 19 achieved the highest efficiencies of 99.693% and 99.237%, respectively. Moreover, BaFe 11.5 Zr 0.5 O 19 adhered to the intra-particle diffusion model, while BaFe 11.5 Zn 0.5 O 19 , BaFe 11.5 Ni 0.5 O 19 , and BaFe 11.5 Gd 0.5 O 19 correspond to the pseudo-second-order model, suggesting that the adsorption mechanism is primarily influenced by chemical processes.

Ferromagnetic ferrofluids in aqueous and low-polar media.

Enhanced magnetodielectric coupling in Co doped Y-type barium hexaferrites at room temperature

Electrochemical monitoring of vanillin using BaFe12O18@carbon black modified electrode in food samples.

A comprehensive analysis of the magnetic properties, crystal structure and magnetic configuration of the ceramic BaFe12O19, prepared using the sol-gel method, was conducted over the temperature range from 4 K to room temperature. The impact of ambient pressure on the crystal and magnetic structures of ceramic BaFe12O19has enabled the determination of bulk modulusB0∼ 123.8 GPa and its first-order derivativeBp' ∼ 4.1, as well as the coefficients of linear compressibility of the lattice parameters for the hexagonal unit cell. The results of neutron diffraction collected at pressures ranging from 0.1 GPa to 5 GPa were analyzed in the framework of both centrosymmetric SG P63/mmc (No. 194) and non-centrosymmetric SG P63mc (No. 186). The decrease in the total magnetic moment with an increase in ambient pressure was associated with a weakening of the exchange interaction in the ferrimagnetic structure, owing to a reduction in the bond angles (∠ Fe-O-Fe) of various iron sublattices.

Evaluation of photocatalysis for methylene blue dye pollutant degradation in the presence of iron-deficient Barium hexaferrites

Evaluation of Magnetic Properties in Barium Hexaferrites with Iron Deficiency

ABSTRACT. Cerium barium ferrite composites (CeBFCs) with improved microwave absorbance in the X-band spectral region are advantageous for varied advanced applications. Thus, the influence of various sintering temperatures on the microwave-absorbing traits of CeBFCs was evaluated. The main objective was to enhance the selective microwave absorption of BFC by modifying its magnetic properties through the substitution of Fe³⁺ with Ce³⁺ in the lattice structures. Four composites of CeBF were synthesized via mechanical alloying and sintered at 600, 800, 1000, and 1100°C. The produced samples were analyzed using XRD, VSM, and VNA to determine their microstructures, magnetic properties, and microwave reflection loss at X-band frequencies. XRD results revealed a significant promotion in forming a more pure crystalline barium hexaferrite phase at sintering temperatures higher than 800°C. This structural enhancement could directly influence the magnetic properties of the specimens with a progressive increase in the saturation magnetization with rising sintering temperature. In addition, the sintering temperature variation effectively modulated the electromagnetic properties (complex relative permeability and permittivity) that are vital for impedance matching and optimal wave absorption. The composite sintered at 1000°C displayed an optimal microwave absorption, indicating the lowest reflection loss within the X-band. The obtained products were shown to attenuate and dissipate surplus electromagnetic energy within the 8-12 GHz frequency range. The observed superior performance of the composites was ascribed to a balanced interplay between the magnetic and dielectric losses, leading to efficient impedance matching. It was affirmed that careful tuning of the sintering temperature can improve the crystalline phases, magnetic, electromagnetic, and microwave absorption properties of the proposed CeBFCs. Keywords: Cerium barium ferrite, Microwave absorption, Reflection loss, Sintering temperature, X-band

Simulation and experimental study on barium hexaferrites with different Ba/Fe molar ratios for a novel stripline circulator applications

Correlation between structure and physical properties in Cu/Al-substituted barium hexaferrites ((Ba1–xCux)(AlxFe12–x)O19; x = 0.0 to 1.0)

Preparation and characterization of barium hexaferrite via the solid-state reaction method

Site-specific structural distortion and enhanced AC conductivity in Ru4 + and Re4+ doped and co-doped M-type barium hexaferrites

Effect of microwave sintering on phase evolution and magnetic behavior of barium hexaferrite

Tailoring the dielectric behavior of BaTiO3 via incorporation of vanadium-substituted barium hexaferrite and thermal effects

Enhanced microwave absorption properties of Nd-doped barium hexaferrite and reduced graphene oxide nanocomposites in the X-band

Magnetic properties of Bi-substituted M-type Barium hexaferrites in the region of single-phase state

Crystal Structure and Electrodynamic Parameters of the BaFe12–xInxO19 (x = 0–5) Indium-Doped Barium Hexaferrite

Abstract This article reports the magnetic phase evolution of M-type barium hexaferrite, BaFe12O19 (BFO), as a function of sintering temperature, along with its effects on magnetization switching, coercivity, and magnetic energy product. Polycrystalline BFO samples were synthesized by a citrate-based auto-combustion sol–gel method, followed by sintering at temperatures ranging from 1100 ∘C to 1350 ∘C. Phase purity of the synthesized samples was confirmed by x-ray diffraction analysis, with Rietveld refinement verifying the formation of a single-phase material without detectable impurities. Scanning electron microscopy revealed systematic grain growth with increasing sintering temperature. Raman spectroscopy further confirmed the correlation between magnetic ion site occupancy and the corresponding magnetization contributions, establishing a clear structure–property relationship. With increasing sintering temperature from 1100 ∘C to 1350 ∘C, magnetic coercivity decreased significantly from 5520 Oe to 340 Oe. This behavior is discussed in terms of magnetization switching mechanisms and magnetic anisotropy variations in the samples. Switching field distribution analysis and differential magnetic susceptibility ( d M / d H ) studies of magnetization curves indicated a clear evolution from single-domain to multi-domain behavior with increasing grain size, along with a transition from pinning-controlled to nucleation-dominated magnetization switching mechanisms. The maximum energy product (BH) max , was also evaluated, and the potential suitability of these materials for permanent magnet applications is discussed.

Corrigendum to “Study of structure, cation distribution and magnetic properties of Ni substituted M-type barium hexaferrite” [Materialia 32 (2023)101898

Responsiveness to multiple stimuli and adaptivity are paramount for designing smart multifunctional materials. In soft, partially ordered systems, these features can often be achieved via self‐assembly, allowing for the combination of diverse components in a complex nanostructured material. Here, an example of a liquid is demonstrated that simultaneously displays both ferroelectric and ferromagnetic types of order. This material is a nanostructured liquid crystalline hybrid comprising ferrimagnetic barium hexaferrite nanoplatelets suspended in a ferroelectric nematic host. Director‐mediated interactions drive the self‐assembly of nanoplatelets in an intricate network. Due to the coupling between the polar electric and magnetic types of order, this material demonstrates magnetically driven electric and nonlinear optical responses, as well as electrically driven magnetic response. Such multiferroic liquids are highly promising for applications in energy harvesting, nonlinear optics, and sensors.