Peculiarities of the microwave properties of hard–soft functional composites SrTb0.01Tm0.01Fe11.98O19–AFe2O4 (A = Co, Ni, Zn, Cu, or Mn)

Trukhanov, S. V.; Algarou, N.A.; Slimani, Y.; Baykal, A.; Тишкевич, Д.И.; Винник, Д.А.; Vakhitov, M.G.; Klygach, D.S.; Silibin, Maxim V.; Zubar, T.I.

doi:10.1039/d0ra05087c

Cited by 97 publications

(20 citation statements)

References 42 publications

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“…where r(x) is a profile deviation from its mean value and L is a sampling length. The calculation of particle size was carried out, taking the particle form as an equivalent sphere, as in [65,66]. The adhesion force (F ad ) was determined using force spectroscopy [67].…”

Section: Afm Investigationsmentioning

confidence: 99%

Combined Effect of Microstructure, Surface Energy, and Adhesion Force on the Friction of PVA/Ferrite Spinel Nanocomposites

Darwish

Zubar

Kanafyev³

et al. 2022

Nanomaterials

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Nanocomposite films based on spinel ferrite (Mg0.8Zn0.2Fe1.5Al0.5O4) in a PVA matrix were obtained. An increase in the spinel concentration to 10 wt.% caused an avalanche-like rise in roughness due to the formation of nanoparticle agglomerates. The lateral mode of atomic force microscopy (AFM) allowed us to trace the agglomeration dynamics. An unexpected result was that the composite with 6 wt.% of filler had a low friction coefficient in comparison with similar composites due to the successfully combined effects of low roughness and surface energy. The friction coefficient decreased to 0.07 when the friction coefficient of pure PVA was 0.72. A specially developed method for measuring nano-objects’ surface energy using AFM made it possible to explain the anomalous nature of the change in tribological characteristics.

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Section: Afm Investigationsmentioning

confidence: 99%

Combined Effect of Microstructure, Surface Energy, and Adhesion Force on the Friction of PVA/Ferrite Spinel Nanocomposites

Darwish

Zubar

Kanafyev³

et al. 2022

Nanomaterials

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“…Dysprosium ions have a significantly larger size and are local defects that prevent the coarsening of crystallites during the synthesis. 3 , 43 …”

Section: Results and Discussionmentioning

confidence: 99%

“…However, it exhibits the biggest size (19 nm) at x = 0.03 and slightly decreases to 17 nm at x = 0.04. The value of the SSA of the investigated samples was calculated from 43 where p i is the content of the fraction (%) obtained by the results of size distribution, n is the number of fraction, and S i refers to the surface area of particles of a given fraction, which was calculated as 43 …”

Section: Results and Discussionmentioning

confidence: 99%

“…The 4f electrons of trivalent rare-earth metal ions in which strong spin–orbit angular momentum coupling is present are shielded by 5s 2 5p 6 subshells, and hence, the surrounding ions’ electric potential remains inert to the 4f electrons. 43 This results in an enhancement in the electromagnetic properties. There are a number of studies investigating the rare-earth substitution effect in spinel ferrites.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Dy³⁺Ions on the Microstructures and Magnetic, Electrical, and Microwave Properties of [Ni_0.4Cu_0.2Zn_0.4](Fe_2–xDy_x)O₄(0.00 ≤x≤ 0.04) Spinel Ferrites

et al. 2021

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[Ni 0.4 Cu 0.2 Zn 0.4 ](Fe 2– x Dy x )O 4 spinel ferrite nanoparticles with different Dy 3+ concentrations (0.00 ≤ x ≤ 0.04) were prepared by a citrate sol–gel auto-combustion technique. A strong correlation among Dy concentration, structural parameters, and magnetic, electrical, and microwave properties was established. An increase in the Dy 3+ concentration is the reason for a rise in the crystal structure parameters (due to different ionic radii of Fe and Dy ions) and a slight increase in the average particle size with a minor reduction in the specific surface area. It was observed that Dy 3+ ions prefer to occupy the octahedral B site due to their large ionic radius (0.91 Å). The explanation of the electrical and magnetic properties was given in terms of the features of Dy 3+ –O 2– –Fe 3+ dysprosium–oxygen–iron indirect exchange. The occurrence of the intensive changes in amplitude–frequency characteristics was observed from 1.6 to 2.7 GHz. The explanation of electromagnetic absorption was given in terms of the peculiarities of the microstructure (resonance of domain boundaries). The results open perspectives in the utilization of [Ni 0.4 Cu 0.2 Zn 0.4 ](Fe 2– x Dy x )O 4 spinel ferrite nanoparticles as functional materials for targeted drug delivery and hyperthermia applications.

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“…In this case, the substituent ions can be subdivided according to their charge and spin state. There are diamagnetic and paramagnetic substitutions when the ions have zero and nonzero total magnetic moment, respectively. The charged states of substitutional ions can vary from 2+ in the case of zinc (Zn 2+ ) and copper (Cu 2+ ) to 6+ in the case of molybdenum (Mo 6+ ) .…”

Section: Introductionmentioning

confidence: 99%

Changes in the Structure, Magnetization, and Resistivity of BaFe_12–xTi_xO₁₉

Винник

Starikov

Живулин

et al. 2021

ACS Appl. Electron. Mater.

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BaFe 12−x Ti x O 19 hexaferrites up to x = 2.00 were fabricated in an ordinary ceramic way. Crystal structure parameters were isothermally defined at 300 K from the powder XRD by the Rietveld technique. The cell constants have nonmonotonic concentration dependence with a local minimum of a ∼ 5.886 Å and V ∼ 698.75 Å 3 at x = 1.00. The occupation mechanism of the titanium cations is confirmed. The Mossbauer investigation confirms such localization of Ti 4+ . Magnetization vs field measurements were realized at 300 K. The law of approach to saturation (LAS) was applied to determine the magnetic loop characteristics. These values decrease almost monotonically with an increase in titanium concentration and temperature. The minimum magnetic values were obtained for x = 2.00 at 300 K. Ac resistivity had a nonmonotonic growth dependence. Minimum ac resistivity was fixed for x = 0.50 at 300 K. As the frequency increases, the ac resistivity decreases, as the value of the band gap. The real part of permittivity ε / rises constantly with increasing temperature and falls with frequency increase for all of the compositions. Changes in the structure, magnetization, and ac resistivity of BaFe 12−x Ti x O 19 were made on the basis of changing charged states of iron ions and the occupation mechanism by titanium ions.

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Peculiarities of the microwave properties of hard–soft functional composites SrTb_0.01Tm_0.01Fe_11.98O₁₉–AFe₂O₄ (A = Co, Ni, Zn, Cu, or Mn)

Abstract: Paper presents the correlation between the composition, microstructure, and microwave properties of composites based on Tb/Tm-doped Sr-hexaferrites and spinel ferrites (AFe2O4), which were fabricated by a one-pot citrate sol–gel method.

Cited by 97 publications

References 42 publications

Combined Effect of Microstructure, Surface Energy, and Adhesion Force on the Friction of PVA/Ferrite Spinel Nanocomposites

Combined Effect of Microstructure, Surface Energy, and Adhesion Force on the Friction of PVA/Ferrite Spinel Nanocomposites

Influence of Dy³⁺Ions on the Microstructures and Magnetic, Electrical, and Microwave Properties of [Ni_0.4Cu_0.2Zn_0.4](Fe_2–xDy_x)O₄(0.00 ≤x≤ 0.04) Spinel Ferrites

Changes in the Structure, Magnetization, and Resistivity of BaFe_12–xTi_xO₁₉

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Peculiarities of the microwave properties of hard–soft functional composites SrTb0.01Tm0.01Fe11.98O19–AFe2O4 (A = Co, Ni, Zn, Cu, or Mn)

Abstract: Paper presents the correlation between the composition, microstructure, and microwave properties of composites based on Tb/Tm-doped Sr-hexaferrites and spinel ferrites (AFe2O4), which were fabricated by a one-pot citrate sol–gel method.

Cited by 97 publications

References 42 publications

Combined Effect of Microstructure, Surface Energy, and Adhesion Force on the Friction of PVA/Ferrite Spinel Nanocomposites

Combined Effect of Microstructure, Surface Energy, and Adhesion Force on the Friction of PVA/Ferrite Spinel Nanocomposites

Influence of Dy3+Ions on the Microstructures and Magnetic, Electrical, and Microwave Properties of [Ni0.4Cu0.2Zn0.4](Fe2–xDyx)O4(0.00 ≤x≤ 0.04) Spinel Ferrites

Changes in the Structure, Magnetization, and Resistivity of BaFe12–xTixO19

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Peculiarities of the microwave properties of hard–soft functional composites SrTb_0.01Tm_0.01Fe_11.98O₁₉–AFe₂O₄ (A = Co, Ni, Zn, Cu, or Mn)

Influence of Dy³⁺Ions on the Microstructures and Magnetic, Electrical, and Microwave Properties of [Ni_0.4Cu_0.2Zn_0.4](Fe_2–xDy_x)O₄(0.00 ≤x≤ 0.04) Spinel Ferrites

Changes in the Structure, Magnetization, and Resistivity of BaFe_12–xTi_xO₁₉