Impact of the heat treatment conditions on crystal structure, morphology and magnetic properties evolution in BaM nanohexaferrites

Труханов, А.В.; Darwish, K. A.; Salem, M.M.; Hemeda, O. M.; Ati, Mohamed; Darwish, Moustafa A.; Kaniukov, Egor; Podgornaya, S.V.; Турченко, В. А.; Tishkevich, D.I.; Zubar, T.I.; Astapovich, K.A.; Kostishyn, V.G.

doi:10.1016/j.jallcom.2021.158961

Cited by 73 publications

(7 citation statements)

References 56 publications

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“…XRD analysis is generally postulated to be a quintessential tool in providing information about the crystal structure of nanomaterials. 53 , 54 The XRD pattern of GO ( Figure 4 a) has a wide diffraction peak at 2θ = 11.6° consistent with the reflection of 001, indicating the successful oxidation of graphite into GO, as was previously elaborated by Mhamane et al, 55 while the pattern of rGO-AuNPs displayed in Figure 4 b confirms the structural changes resulting from the phytosynthesis of the rGO-AuNP nanocomposite. It showed the characteristic peak of graphene at 2θ = 28.6°, and the AuNP peaks at 38.2, 44.3, 64.8, and 78.2° were indexed to (111), (200), (220), and (311), which well matched with the JCPDS file number 04-0784 and were in agreement with XRD results reported for green synthesized rGO-AuNPs by many workers.…”

Section: Resultssupporting

confidence: 76%

Catalytic and Medical Potential of a Phyto-Functionalized Reduced Graphene Oxide–Gold Nanocomposite Using Willow-Leaved Knotgrass

et al. 2021

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In the current study, a simple, environmentally friendly, and cost-effective reduced graphene oxide–gold nanoparticle (rGO-AuNP) nanocomposite was successfully phytosynthesized using the aqueous leaf extract of a common weed found on the Nile banks, Persicaria salicifolia , for the first time. The phytosynthesis of rGO-AuNPs was first confirmed via the color transformation from brown to black as well as throughvarious techniques such as transmission electron microscopy (TEM) and Raman spectroscopy. Two UV–vis peaks at 275 and 530 nm were observed for the nanocomposite with a typical particle size of mostly spherical AuNPs of 15–20 nm. However, other shapes were occasionally detected including rods, triangles, and rhomboids. Existing phytoconstituents such as flavonoids and glycosides in the plant extract were suggested to be responsible for the phytosynthesis of rGO-AuNPs. The excellent catalytic efficacy of rGO-AuNPs against MB degradation was confirmed, and a high antibacterial efficiency against Escherichia coli and Klebsiella pneumonia was also confirmed. Promising antioxidant performance of rGO-AuNPs was also proved. Furthermore, it was concluded that rGO-AuNPs acquired higher efficiency than AuNPs synthesized from the same plant extract in all of the studied applications.

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Section: Resultssupporting

confidence: 76%

Catalytic and Medical Potential of a Phyto-Functionalized Reduced Graphene Oxide–Gold Nanocomposite Using Willow-Leaved Knotgrass

et al. 2021

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“…wakif et al 8 studied the magneto-convection process under heat influence and found that the thermo-magneto-hydrodynamic feature depends on electric properties and size of the nanoparticles shows a destabilizing effect. Trukhanov et al 9 obtained hexaferrite nano particles by sol gel method with sintering temperature of 600–1100 °C and found that the average particle size and specific surface area of the obtained samples increases with increase in temperature. Singh et al 10 prepared hexaferrite nano particles by a two route ceramic technique and found that doping of Cr +3 and Co +2 reduce thickness and increase the absorption which is attributed to input impedance and eddy current losses.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of manganese ferrite from low grade manganese ore through solid state reaction route

Ahmad

Ali

Ullah

et al. 2021

Sci Rep

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Manganese ferrite spinel has been synthesized by using low grade manganese ore and ferric oxide as sources of manganese oxide and iron oxide through solid state reaction route by taking manganese and iron mole ratio of 1:2 respectively. The impact of sintering temperature on phase composition and particle size is investigated. Similarly, the impact of frequency on dielectric constant, dielectric loss, AC (alternating current) conductivity and tangent losses is also investigated. The results shows the presence of spinel structure manganese ferrite (MnFe2O4) as the major phase for the sample sintered at 1200 °C. It has been established that the crystallite size increase with rise in sintering temperature. The surface morphology of the sample sintered at 1200 °C show pyramidal and triangular shape grains. The dielectric constant (εʹ) and dielectric losses (εʹʹ) were observed to decrease with increasing the sintering temperature and frequency. Furthermore, the AC (alternating current) conductivity was found to rise with rise in applied frequency. On the other hand, the tangent losses falls considerably with rise in applied frequency.

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“…Such distinction of the ZFC and FC curves for all the samples may be explained by the high stiffness and anisotropy of the Fe 3+ –O 2− –Fe 3+ exchange interactions 49 . As it well known the T f freezing temperature determines the average size of a magnetically ordered inclusion, which can be a magnetically ordered cluster, in a magnetically disordered matrix or just a fine particle in powder.…”

Section: Resultsmentioning

confidence: 95%

Features of structure, magnetic state and electrodynamic performance of SrFe12−xInxO19

Турченко

Труханов

Костишин

et al. 2021

Sci Rep

109

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Indium-substituted strontium hexaferrites were prepared by the conventional solid-phase reaction method. Neutron diffraction patterns were obtained at room temperature and analyzed using the Rietveld methods. A linear dependence of the unit cell parameters is found. In3+ cations are located mainly in octahedral positions of 4fVI and 12 k. The average crystallite size varies within 0.84–0.65 μm. With increasing substitution, the TC Curie temperature decreases monotonically down to ~ 520 K. ZFC and FC measurements showed a frustrated state. Upon substitution, the average and maximum sizes of ferrimagnetic clusters change in the opposite direction. The Mr remanent magnetization decreases down to ~ 20.2 emu/g at room temperature. The Ms spontaneous magnetization and the keff effective magnetocrystalline anisotropy constant are determined. With increasing substitution, the maximum of the ε/ real part of permittivity decreases in magnitude from ~ 3.3 to ~ 1.9 and shifts towards low frequencies from ~ 45.5 GHz to ~ 37.4 GHz. The maximum of the tg(α) dielectric loss tangent decreases from ~ 1.0 to ~ 0.7 and shifts towards low frequencies from ~ 40.6 GHz to ~ 37.3 GHz. The low-frequency maximum of the μ/ real part of permeability decreases from ~ 1.8 to ~ 0.9 and slightly shifts towards high frequencies up to ~ 34.7 GHz. The maximum of the tg(δ) magnetic loss tangent decreases from ~ 0.7 to ~ 0.5 and shifts slightly towards low frequencies from ~ 40.5 GHz to ~ 37.7 GHz. The discussion of microwave properties is based on the saturation magnetization, natural ferromagnetic resonance and dielectric polarization types.

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Impact of the heat treatment conditions on crystal structure, morphology and magnetic properties evolution in BaM nanohexaferrites

Cited by 73 publications

References 56 publications

Catalytic and Medical Potential of a Phyto-Functionalized Reduced Graphene Oxide–Gold Nanocomposite Using Willow-Leaved Knotgrass

Catalytic and Medical Potential of a Phyto-Functionalized Reduced Graphene Oxide–Gold Nanocomposite Using Willow-Leaved Knotgrass

Synthesis and characterization of manganese ferrite from low grade manganese ore through solid state reaction route

Features of structure, magnetic state and electrodynamic performance of SrFe12−xInxO19

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