Plasma-chemical reactor based on a low-pressure pulsed arc discharge for synthesis of nanopowders

Карпов, И. В.; Ушаков, А. В.; Лепешев, А. А.; Fedorov, L. Yu.

doi:10.1134/s106378421701011x

Cited by 30 publications

(11 citation statements)

References 11 publications

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“…According to [3][4][5][6][7] It is known [9,16] that in CuO the exchange interaction is of the order of ~ 400 K, and the short-range ferromagnetic order can be remained up to high temperatures.…”

Section: Results and Analysismentioning

confidence: 99%

“…Thus, further study of the magnetic properties of the produced CuO nanopowders over a wide temperature range, is of current importance. To prevent the influence of magnetic impurities 2 and the phase inhomogeneity of CuO, there were undertaken the particular measures, described in detail in [3][4][5][6][7]. This behavior of CuO nanoparticles fundamentally differs from the properties of the "bulk analogue", in particular polycrystalline CuO [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Peculiarities of Magnetic Behavior of CuO Nanoparticles Produced by Plasma-Arc Synthesis in a Wide Temperature Range

Ушаков

Карпов

Лепешев

2017

J Supercond Nov Magn

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Copper oxide nanoparticles, produced by direct plasmochemical synthesis in a lowpressure arc discharge plasma, show a wide variety of magnetic properties depending on the strength of the external magnetic field and the temperature. At low strength of the field and throughout the studied temperature range the ferromagnetic state dominates. This state is caused by disordering of the spins on the surface of the nanoparticles. At high strength of the field and under the temperatures of less than 200 K, nanoparticles exhibit a paramagnetic state due to the spin-glass behavior of copper atoms. At high strength of the field (more than 3 kOe) and under the temperature of above 300 K, the diamagnetic state of nanoparticles is observed, due to local eddy currents caused by oxygen vacancies. The temperature of antiferromagnetic ordering under study is significantly lowered (down to ~ 100 K).

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Section: Results and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Peculiarities of Magnetic Behavior of CuO Nanoparticles Produced by Plasma-Arc Synthesis in a Wide Temperature Range

Ушаков

Карпов

Лепешев

2017

J Supercond Nov Magn

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“…The technological features of the synthesis of nanopowders in a plasma of a lowpressure arc discharge, as well as the experimental setup, are described in detail in [20][21][22]. For the synthesis of nickel oxide nanopowder, a high-purity cathode (99.9%) was used.…”

Section: Methodsmentioning

confidence: 99%

“…To obtain nickel oxide nanoparticles, various physicochemical methods are used, such as sol-gel, chemical deposition, microwave method, plasma-chemical methods [12,[14][15][16][17][18][19]. The plasma-chemical method in a plasma of a low-pressure arc discharge has shown its high efficiency in the synthesis of copper oxide nanoparticles [20][21][22]. Nanoparticles with an average size of less than 10 nm were obtained.…”

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confidence: 99%

The effect of microstructural features on the ferromagnetism of nickel oxide nanoparticles synthesized in a low-pressure arc plasma

Ушаков

Карпов

Fedorov

et al. 2020

Physica E: Low-dimensional Systems and Nanostructures

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Nickel oxide nanoparticles were first synthesized by sputtering high-purity nickel in an oxygen plasma of a low-pressure arc discharge. The structure, morphology, and optical and magnetic properties of NiO nanoparticles were studied by XRD, TEM, FTIR, UV-VIS, and VSM. TEM images showed that the obtained NiO nanoparticles have a narrow particle size distribution and an average particle size of 12 nm. The XRD results and the processing of diffractograms by the Rietveld method showed that the obtained nanoparticles have a face-centered cubic lattice with an average particle size of 13 nm. With decreasing temperature, residual stresses increase and peaks corresponding to the superstructure appear.The band gap of NiO was determined from the optical absorption spectrum and amounted to 3.21 eV.Magnetic measurements showed that, at temperatures of 200 and 300 K, NiO nanoparticles, unlike bulk particles, exhibit ferromagnetic behavior, and at 5K a magnetic hysteresis loop appears. Based on the studies, a dendritic model of the nanoparticle microstructure is proposed.

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“…The synthesis of CuO nanopowder was performed in a plasma-chemical reactor, described in [8][9][10][11][12]. The arc evaporator, used in the process, had the following characteristics: a current arc of 100 A and an intensity of the longitudinal magnetic field excited by a focusing coil on the surface of the cathode, of 80 A/m, with a distance between the cathode and the anode of d = 50 mm.…”

Section: Methodsmentioning

confidence: 99%

Magnetic Properties and Critical Current of Superconducting Nanocomposites (1 −x)YBa2Cu3O7−δ + xCuO

Лепешев

Patrin

Yurkin

et al. 2018

J Supercond Nov Magn

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The aim of this paper was to study the effect of nanoscale inclusions of CuO as the second ingredient of composites on transport properties of superconducting YBa 2 Cu 3 O 7 polycrystals. The samples of YBa 2 Cu 3 O 7−δ with different content of CuO nanoparticles were synthesized. The analysis of the magnetic properties was carried out within the extended critical state model. It was found that the addition of 0.5 and 1% of CuO nanoparticles leads to an increase in the intragranular density of the critical current at T = 4.2 K. A further increase of x from 2 to 15% and more than 40% decreases the critical current density. The critical current density higher than in the reference sample was also found in the samples with x = 20% and x = 24%.

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Plasma-chemical reactor based on a low-pressure pulsed arc discharge for synthesis of nanopowders

Cited by 30 publications

References 11 publications

Peculiarities of Magnetic Behavior of CuO Nanoparticles Produced by Plasma-Arc Synthesis in a Wide Temperature Range

Peculiarities of Magnetic Behavior of CuO Nanoparticles Produced by Plasma-Arc Synthesis in a Wide Temperature Range

The effect of microstructural features on the ferromagnetism of nickel oxide nanoparticles synthesized in a low-pressure arc plasma

Magnetic Properties and Critical Current of Superconducting Nanocomposites (1 −x)YBa2Cu3O7−δ + xCuO

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