Formation of Cobalt Ferrite Nanoparticles via Glycine-Nitrate Combustion and Their Magnetic Properties

Martinson, K.D.; Cherepkova, I. A.; Соколов, В. В.

doi:10.1134/s1087659618010091

Cited by 14 publications

(11 citation statements)

References 9 publications

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“…In addition, the obtained images clearly demonstrate that this sample consists of loose nanostructured compositions. This feature is most likely related to the shift of the maximum point of the real combustion temperature, which was repeatedly mentioned in a number of other works [16,17].…”

Section: Resultsmentioning

confidence: 55%

Facile combustion synthesis of TbFeO3 nanocrystals with hexagonal and orthorhombic structure

Martinson¹,

Ivanov²,

Chebanenko³

et al. 2019

Nanosystems: Phys. Chem. Math.

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In this research, the formation process of nanocrystalline terbium orthoferrite (TbFeO 3) obtained via a solution combustion technique was studied using powder X-ray diffractometry, scanning electron microscopy, 57 Fe Mössbauer spectroscopy, N 2 adsorption analysis, and FTIR spectroscopy. It was shown that glycine-nitrate combustion method permits one to obtain TbFeO 3 of three different modifications: orthorhombic o-TbFeO 3 (Pbnm), hexagonal h-TbFeO 3 (P6 3 /mmc) and amorphous am-TbFeO 3. It was found that the average crystallite sizes of orthorhombic and hexagonal TbFeO 3 were 29±3 and 15±2 nm, respectively. The formation mechanism of different structural forms of terbium orthoferrite was investigated on the basis of nanopowders morphology, specific surface areas, average pore sizes, and crystallite sizes.

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Section: Resultsmentioning

confidence: 55%

Facile combustion synthesis of TbFeO3 nanocrystals with hexagonal and orthorhombic structure

Martinson¹,

Ivanov²,

Chebanenko³

et al. 2019

Nanosystems: Phys. Chem. Math.

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“…When the Red / Ox ratio is shifted toward excess and deficiency, a slight decrease in crystallite sizes is observed up to 22 nm in the case of fuel lack and up to 24 nm in the case of fuel excess. Such changes are also associated with the nanocrystals formation temperature and are described in detail in previous works [13,23].…”

Section: Resultsmentioning

confidence: 65%

“…The electromagnetic parameters of ferrites depend on many factors, such as the presence of additional M 2+ cations in the spinel structure (Co, Ni, Zn, Mn, Mg), crystallite size, microstructure and morphology [11][12][13]. All of the above factors are directly dependent on the technology of obtaining both the initial pre-ceramic powder and the temperature conditions of sintering of the final ceramic product [14].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Red / Ox ratio on the structure and magnetic behavior of Li0.5Fe2.5O4 nanocrystals synthesized by solution combustion approach

et al. 2019

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In this research, nanocrystalline lithium ferrite (Li 0.5 Fe 2.5 O 4 ) was synthesized using the solution combustion approach with using glycine as fuel and a chelating agent at various Red / Ox ratios ("glycine to nitrate" ratio G / N = 0.4, 0.6, 0.8, 1.0). According to the data of energy-dispersive X-ray spectroscopy (EDX) and atomic absorption spectroscopy (AAS), the prepared samples correspond in their composition to stoichiometric ferrite Li 0.5 Fe 2.5 O 4 within the error of the determination methods used. The results of powder X-ray diffractometry (PXRD) confirmed the formation of α-Li 0.5 Fe 2.5 O 4 at G / N ratio of 0.8 and 1.0 and the presence of β-Li 0.5 Fe 2.5 O 4 modification in case of deficiency (G / N = 0.4) and stoichiometry (G / N = 0.6) of the chelating agent. It is shown that a change in the Red / Ox composition of reacting solutions affects not only the phase composition of the synthesized lithium ferrite samples, but also the crystallite size, which lies in the range from 22 to 35 nm. Based on the scanning electron microscopy (SEM) data, it was found that Li 0.5 Fe 2.5 O 4 powders had a developed porous microstructure consisting of micron agglomerates. According to the vibration magnetometry data of nanocrystalline lithium ferrite powders, it follows that all synthesized compositions have a pronounced ferrimagnetic behavior, despite the presence of β-modification in some of them. It is shown that by varying the Red / Ox environment and, as a consequence, the phase composition and crystallite size, it is possible to obtain Li 0.5 Fe 2.5 O 4 nanocrystals with magnetic parameters in the following ranges: saturation magnetization (M s ) = 51.6 -61.9 emu / g, residual magnetization (M r ) =14.3 -17.8 emu / g, coercive force (H c ) =109 -135 Oe.

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“…A distinctive feature of the above methods is the ability to carry out the targeted synthesis of nanostructures with controlled particle size and shape as well as morphological and structural features [25]. Different varieties of solution combustion methods stand out, which, due to their simplicity [26] and the possibility of industrial scaling [27], are one of the most popular methods for obtaining nanostructured spinel ferrites of various compositions [28]. An important property of combustion methods is the large number of synthesis parameters, the variation of which makes it possible to change the structural and functional characteristics of the resulting powders across a wide range of values.…”

Section: Introductionmentioning

confidence: 99%

Effect of fuel type on solution combustion synthesis and photocatalytic activity of NiFe2O4 nanopowders

Martinson¹,

Belyak²,

Sakhno³

et al. 2021

Nanosystems: Phys. Chem. Math.

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Nickel ferrite nanopowders were obtained under conditions of solution combustion with the addition of various types of organic fuels (glycine, ascorbic acid, oxalic acid, and malic acid) and studied as photocatalysts in the photodegradation of methylene blue. Photocatalytic measurements were carried out under the action of visible light in model dye solutions. The highest photocatalytic activity was found in the case of a sample synthesized using malic acid as a fuel and in which the largest specific surface area (128.1 m 2 /g) and the smallest particle size (18 nm) were observed. The obtained dependences of the photocatalytic activity of the synthesized samples demonstrate its strong dependence on morphological and structural parameters. Thus, with an increase in the particle size and a decrease in the specific surface area, a decrease in the efficiency of a photocatalyst based on nickel ferrite is observed. In addition, the use of various types of fuels made it possible to obtain aggregates of various shapes and sizes up to several tens of micrometers. The resulting rate constants were established to vary from 0.00756 to 0.00867 min −1 .

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Formation of Cobalt Ferrite Nanoparticles via Glycine-Nitrate Combustion and Their Magnetic Properties

Cited by 14 publications

References 9 publications

Facile combustion synthesis of TbFeO3 nanocrystals with hexagonal and orthorhombic structure

Facile combustion synthesis of TbFeO3 nanocrystals with hexagonal and orthorhombic structure

Effect of the Red / Ox ratio on the structure and magnetic behavior of Li0.5Fe2.5O4 nanocrystals synthesized by solution combustion approach

Effect of fuel type on solution combustion synthesis and photocatalytic activity of NiFe2O4 nanopowders

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