Plasma dynamic synthesis and obtaining ultrafine powders of iron oxides with high content of ε-Fe2O3

Сивков, А. А.; Найден, Е. П.; Ивашутенко, А. С.; Shanenkov, Ivan

doi:10.1016/j.jmmm.2015.12.072

Cited by 44 publications

(14 citation statements)

References 37 publications

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“…Recently, various studies on ε‐Fe 2 O 3 have been reported. For example, neutron diffraction measurements, Mössbauer measurements, dielectric permittivity measurements, photocatalytic activities, phase transformation studies, and theoretical calculations have been reported, and new synthesis methods from wet processes, , to dry processes have been investigated. Additionally, metal‐substituted ε‐Fe 2 O 3 , ε‐ M x Fe 2– x O 3 ( M = Al, Ga, In, Rh, etc.…”

Section: Introductionmentioning

confidence: 99%

Highly Oriented Magnetic Film Composed of Ga‐Substituted ε‐Iron Oxide and the Angular Dependence of the Magnetic Hysteresis Loops

et al. 2017

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Abstract:We report a magnetic film based on crystallographically oriented metal-substituted ε-iron oxide, ε-Ga 0.45 Fe 1.55 O 3 . This film was prepared by mixing nanoparticles and a vehicle resin under an applied external magnetic field. The a-axis of the orthorhombic crystal structure with a Pna2 1 space group is oriented out of the plane of the film. The degree of orientation is very high with a Lotgering factor of 0.94. The angular dependence of the magnetic hysteresis loops at room temperature shows a rectangular hysteresis loop with a coercive field of 9.7 kOe and a magnetization of 30.4 emu g -1 at 7 T (tesla) when

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Section: Introductionmentioning

confidence: 99%

Highly Oriented Magnetic Film Composed of Ga‐Substituted ε‐Iron Oxide and the Angular Dependence of the Magnetic Hysteresis Loops

et al. 2017

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“…The formation process of ultra-and nanodispersed particles in the CMPA-based system was considered in detail earlier [20]. The higher current leads to the increase in the temperature and plasma flow speed.…”

Section: Resultsmentioning

confidence: 99%

Plasma dynamic synthesis of iron oxides in a discharge plasma jet with possibility to control final phase composition

Shanenkov

Сивков

Ивашутенко

et al. 2017

J. Phys.: Conf. Ser.

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Abstract. Magnetite Fe3O4 and epsilon iron oxide ε-Fe2O3, having excellent frequency characteristics and high electrical resistivity, are considered as the most promising phases among all iron oxides for high-frequency equipment in order to increase the working frequency of the data transmission. Despite the large number of existing methods for synthesizing these materials, many of them do not provide both of these phases. In opposite to these methods, the plasma dynamic synthesis can provide the synthesis of necessary phases in a one-step process. The process is implemented in an electrodischarge iron-containing plasma jet, which interacts with gaseous precursor (oxygen). The use of plasma jet allows obtaining nanoscale powdered products. This work shows the results of the experiment series, where the influence of initial energy parameters on the final phase composition was studied. It is found that the plasma dynamic synthesis allows obtaining both magnetite Fe3O4 and epsilon phase ε-Fe2O3 during one short-term process (less than 1 ms). It is also established that the final phase composition strongly depends on the initial parameters of the system. The increased energy parameters lead to the formation of the product with predominant content of epsilon phase, while lower parameters allow synthesizing magnetite phase. Thus, by changing energy parameters, it is possible to control the final composition in the considered system.

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“…Nanomaterials based on iron(III) oxides, eventually functionalized with metal or metaloxide nanoparticles (NPs), are attractive platforms for various technological applications, encompassing biomedicine, (photo)catalysis, solar assisted H2 generation, gas sensing/batter ies, and magnetic devices [1][2][3][4][5][6][7]. To this regard, due to the search for iron oxide-based nanomateria ls endowed with specific features, the scarcely investigated ferrimagnetic -Fe2O3 polymorph has emerged for its peculiar properties with respect to the most stable and widely studied -Fe2O3 and -Fe2O3 [8][9][10][11][12]. Indeed, -Fe2O3 nanomaterials diplay a superior activity in solar-assisted photocatalytic process [2][3][13][14] and intriguing magnetic properties, such as giant roomtemperature coercive field, that can be exploited for the fabrication of electric/magnetic field or multiple-state memory devices [1,[15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…In order to meet the open scientific and technological demands, the availability of versatile fabrication and processing techniques, enabling material fabrication under controlled conditions onto suitable substrates, is highly demanded [1,8,10,16,23,[33][34][35], especially for -Fe2O3-Au and -Fe2O3-CuO materials. In fact, the systhesis of supported single phase -Fe2O3 nanosystems with tailored nano-organization is still a challenging issue.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of ε iron(III) oxide nanorod arrays functionalized with gold and copper(II) oxide

Maccato

Carraro

Peddis

et al. 2018

Applied Surface Science

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A sequential chemical vapor deposition (CVD)-radio frequency (RF)-sputtering approach was adopted to fabricate supported nanocomposites based on the scarcely investiga ted ε-iron(III) oxide polymorph. In particular, ε-Fe2O3 nanorod arrays were obtained by CVD, and their subsequent functionalization with Au and CuO nanoparticles (NPs) was carried out by RF-sputtering under mild operational conditions. Apart from a multi-technique characteriza tio n of material structure, morphology and chemical composition, particular efforts were dedicated to the investigation of their magnetic properties. The pertaining experimental data, discussed in relation to the system chemico-physical characteristics, are directly dependent on the actual chemical composition, as well as on the spatial distribution of Au and CuO nanoparticles. The approach adopted herein can be further implemented to control and tailor differe nt morphologies and phase compositions of iron oxide-based nanomaterials, meeting thus the open requests of a variety of technological utilizations.

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Plasma dynamic synthesis and obtaining ultrafine powders of iron oxides with high content of ε-Fe2O3

Cited by 44 publications

References 37 publications

Highly Oriented Magnetic Film Composed of Ga‐Substituted ε‐Iron Oxide and the Angular Dependence of the Magnetic Hysteresis Loops

Highly Oriented Magnetic Film Composed of Ga‐Substituted ε‐Iron Oxide and the Angular Dependence of the Magnetic Hysteresis Loops

Plasma dynamic synthesis of iron oxides in a discharge plasma jet with possibility to control final phase composition

Magnetic properties of ε iron(III) oxide nanorod arrays functionalized with gold and copper(II) oxide

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