Effect of Nickel Ions Substitution on the Structural and Electrical Properties of a Nanosized Lithium-iron Ferrite Obtained by the Sol-gel Auto-combustion Method

Kaykan, L. S.; Mazurenko, Julia; Yaremiy, I. P.; Bandura, Khrystyna; Ostapovych, N. V.

doi:10.21272/jnep.11(5).05041

Cited by 5 publications

(4 citation statements)

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“…Nickel-substituted lithium-iron spinels of the general composition Li0.5-x/2NixFe2.5-x/2O4, 0.2≤x≤1.0 were synthesized by the sol-gel autocombustion method [23]. In more detail, the sample preparation conditions and detailed structural and morphological analysis of the obtained ferrites are given in [5]. In the same work, particle sizes were determined based on X-ray diffraction (XRD) studies using the Debye-Scherrer and Williamson-Hall methods.…”

Section: Methodsmentioning

confidence: 99%

“…The increased interest in the study of ferrite materials [1][2][3][4], especially finely dispersed ones [5][6], the particle size of which is in the nanoscale range, is due to their extremely wide range of applications. This includes the production of miniature electronic devices [7], means of recording and storing information [8], the creation of rechargeable energy sources [9], and much more [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Nickel Ions Substitution on the Magnetic and Optical Properties of a Nanosized Lithium-Iron Ferrite

Mazurenko

Kaykan

Żywczak

et al. 2023

JNanoR

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This paper reports on the successful synthesis of fine nanoparticles of nickel-substituted lithium-iron ferrites of composition Li0.5-x/2NixFe2.5-x/2O4 (0.2≤ x ≤1.0) by the sol-gel autocombustion method. It has been found that the alternating current (AC) and direct current (DC) conductivity is preferably tuned due to its dependence on temperature and nickel doping. Analysis of the Arrhenius dependences also confirms the appearance of more than one conduction mechanism upon substitution. The predominance of one type of conductivity over another depends on the concentration of the substituting element. Measurement of the magnetic properties has shown that the substitution of Ni2+ can significantly change the saturation and residual magnetization. Samples of composition Li0.4Ni0.2Fe2.4O4 have the highest saturation magnetization (84.08 emu/g), residual magnetization (15.85 emu/g), and the lowest coercive force (0.18 kOe). All the obtained results indicate a significant effect of the substitution of Ni2+ ions on the structure and properties of Li0.5-x/2NixFe2.5-x/2O4 ferrite nanoparticles.Photocatalytic properties have been obtained by the degradation of Methylene Blue dye under illumination with a halogen lamp. It is shown that an increase in the content of nickel ions leads to a change in the type of conductivity: from n-type (unsubstituted lithium pentaferrite) to p-type (with substitution x = 0.8 and higher). These systems are characterized by hopping conduction realized by octa-positions according to the mechanisms Fe3++e-↔Fe2+, and Ni3+↔Ni2++h+. The predominance of one or another mechanism depends on the content of nickel ions. The optical band gap ranges from 1.4 to 2.25 eV. Samples with nickel content x = 0.4 and x = 0.8 have shown the best degradation ability, which is 97% within 160 min for Methylene Blue.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Nickel Ions Substitution on the Magnetic and Optical Properties of a Nanosized Lithium-Iron Ferrite

Mazurenko

Kaykan

Żywczak

et al. 2023

JNanoR

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“…Figure 6 shows the dependence of the area under the third magnetically ordered component ( As can be seen from the figure, there is a clear inverse relationship: a larger area corresponds to a smaller particle size. Reduction of effective magnetic fields on 57 Fe nuclei associated with different amounts of indirect exchange bonds for internal and surface iron ions, which are deprived of a significant part of such connections [8]. Particle size it is possible to estimate, taking into account value of areas under the subspectra.…”

Section: Tablementioning

confidence: 99%

Nickel substituted effect of on structural, Mössbauer and dielectric properties of spinel-type lithium ferrites

Mazurenko

2020

Phys. Chem. Solid St.

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Ni-substituted lithium ferrite Li0.5-x/2NixFe2.5-x/2O4, where (х=0.0, 0.2, 0.4, 0.6, 0.8, 1.0) synthesized through sol-gel auto-combustion method was investigated for its structural, Mossbauer, and dielectric properties. At low doses of substitution, two spinels of the same composition coexist in the structure, one of spatial group P4332, so-called spinel with superstructure, in which the iron and lithium ions are arranged along the crystallographic direction <110> and the other is a spatial group Fd3m, random spinel. The presence of both spinels is observed at low content of the doped element (x = 0.2 and 0.4). In case of increase Ni2+ ions, random component disappears and only the ordered phase remains. The particle sizes of the synthesized product are around 22-45 nm. According to the proposed cationic distribution of Nickel ions are localized in the A-site and lithium ions in the B-site. Iron ions are redistributed over both sites at a ratio of about 1:2. It is shown, that the conductive and dielectric properties of the synthesized powders have a frequency dependence characteristic of ferrite materials, the behavior of which is explained based on the hopping mechanism of conductivity and inter-grain polarization.

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“…Substitution of lithium ferrite in the spinel lattice significantly changes the properties of the material [1][2][3][4][5][6]. So, depending on the type of substitution and the method of synthesis, the magnetic characteristics vary widely.…”

Section: Introductionmentioning

confidence: 99%

Study of Li-Al Ferrites by Nuclear Magnetic Resonance, UV-Spectroscopy, and Mossbauer Spectroscopy

Mazurenko¹,

Kaykan²,

Zywczak³

et al. 2023

J. Nano- Electron. Phys.

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The paper presents the study of lithium ferrites substituted by aluminum ions by the methods of nuclear magnetic resonance (NMR), Mössbauer spectroscopy, and using a vibrating magnetometer of samples at room temperature. The resulting magnetic moment of the system depends both on the content of the substituting element and on the selective injection into the A or B sublattice. Al 3+ and Li + cations occupy octahedral (B) sites, while Fe 3+ is distributed in both ones. Implementation of Al 3+ in the B-position reduces the intensity of the IFNMR echo amplitude. Moreover, an increase in the aluminum content reduces the value of the magnetic superexchange field and causes rapid growth of the paramagnetic component (doublet in Mössbauer spectra). A decrease in saturation magnetization leads to a decrease in signal intensity. Our results showed that NMR and Mössbauer spectroscopy are complementary techniques for describing the magnetic properties of Li-Al ferrites in a wide range of frequencies. Studies of the degradation of methylene blue in an aqueous medium have shown that the synthesized ferrite can act as a photocatalyst operating in the visible light range. It is shown that the optical band gap and the degradation coefficient are inversely related.

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Effect of Nickel Ions Substitution on the Structural and Electrical Properties of a Nanosized Lithium-iron Ferrite Obtained by the Sol-gel Auto-combustion Method

Cited by 5 publications

References 0 publications

Effect of Nickel Ions Substitution on the Magnetic and Optical Properties of a Nanosized Lithium-Iron Ferrite

Effect of Nickel Ions Substitution on the Magnetic and Optical Properties of a Nanosized Lithium-Iron Ferrite

Nickel substituted effect of on structural, Mössbauer and dielectric properties of spinel-type lithium ferrites

Study of Li-Al Ferrites by Nuclear Magnetic Resonance, UV-Spectroscopy, and Mossbauer Spectroscopy

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