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Kostishin V.G.,National Research University iS | Vergazov R.M.,Kuznetsk Institute of Information and Management Technologies | Andreev V.G.,Kuznetsk Institute of Information and Management Technologies | Bibikov S.B.,RAS Emanuel Institute of Biochemical Physics | And 2 more authors.
Russian Microelectronics | Year: 2011

The main approaches and results concerning an increase in the efficiency of broadband radio- absorbing nickel-zinc ferrites are reported. Requirements to the microstructure that ensure the expansion of the radio-absorption frequency range to 30-830 MHz have been developed. The effect of dopants on the fre- quency dependence of the absorption of electromagnetic waves has been analyzed. The efficiency of the for- mation of the coarse-grain structure with grain boundary layers having a high dielectric constant has been confirmed. It has been found that both doping with bismuth oxide and the introduction of a coarse-grain frac- tion of the same composition into a batch before the sintering of the powder enhance the absorbing properties of the ferrites. © Pleiades Publishing, Ltd., 2011.


Kostishin V.G.,National Research Technological University iS | Andreev V.G.,Kuznetsk Institute of Information and Management Technologies | Chitanov D.N.,National Research Technological University iS | Timofeev A.V.,National Research Technological University iS | And 2 more authors.
Technical Physics | Year: 2015

We analyze the effect of duration of dry crushing of strontium hexaferrite powders (manufactured at joint-stock corporation Olkon) in a vibratory mill on the degree of disaggregation of powders and on the properties of articles on their basis. It is shown that an increase in the vibrational frequency of the vibromill from 25 to 50 Hz with the amplitude of vibrations maintained in the limits 3–4 mm makes it possible to reduce by 5 times the crushing time ensuring complete disaggregation of powders. An increase in the impact energy of balls with increasing vibrational frequency activates the powders due to microdistortions appearing in the crystal lattice. An increase in the degree of disaggregation of powders leads to sintering and formation of a dense fine-grain microstructure ensuring an increase in the maximal energy product (BH)max of magnets by 15–20%. © 2015, Pleiades Publishing, Ltd.


Andreev V.G.,Kuznetsk Institute of Information and Management Technologies | Menshova S.B.,Kuznetsk Institute of Information and Management Technologies | Klimov A.N.,Kuznetsk Institute of Information and Management Technologies | Vergazov R.M.,Kuznetsk Institute of Information and Management Technologies | And 2 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2015

In this work there have been carried out studies in the radiophysical characteristics of the samples of Ni-Zn ferrite radio-absorbing materials, obtained by the ceramic method under different technological conditions. There has been established the influence of microstructure on the electromagnetic losses of Ni-Zn ferrite radio-absorbing materials. The results indicate that the coarse-grained structure leads to an increase of radio-absorbing capacity at frequencies below 30 MHz. It can be explained by the resonance of domain boundaries. © 2015 Elsevier B.V. All rights reserved.


Kostishyn V.G.,National University of Science and Technology "MISIS" | Andreev V.G.,Kuznetsk Institute of Information and Management Technologies | Ursulyak N.D.,OAO NPP Shokin Istok | Nalogin A.G.,OAO NPP Shokin Istok | And 4 more authors.
Journal of Surface Investigation | Year: 2015

The possibility of increasing the coercive force of barium hexaferrite by the isomorphous substitution of iron oxide with alumina, gallium and scandium oxides, and by impurity doping is shown. The results of the synthesis and study of new a (Me+2Me+4)xMey + 3Fe12–x–yO19 hexagonal ferrites with thermally stable anisotropy field and coercive force are presented. It is shown that doping with metal vapors of Me+2Me+4 = Ni+2Ti+4, Ni+2Ge+4, Ni+2Cu+2Ge+4, Me+3 = Al+3, Cr+3 allows improvement in the reproducibility of the properties and the thermal stability of barium hexaferrite. © 2015, Pleiades Publishing, Ltd.


Andreev V.G.,National University of Science and Technology "MISIS" | Kostishyn V.G.,National University of Science and Technology "MISIS" | Ursulyak N.D.,JSC RPC ISTOK named after Shokin | Nalogin A.G.,JSC RPC ISTOK named after Shokin | Kudashov A.A.,Kuznetsk Institute of Information and Management Technologies
Journal of Nano- and Electronic Physics | Year: 2015

The influence of the modes of wet grinding of the original ferrite-forming components on their activity and the temperature of the synthesis powders of hexaferrites. It is shown that grinding of the initial components in the acidic environment can reduce the synthesis temperature of hexaferrites. The increased activity of the powders during milling in acidic medium due to the formation on the surface of particles of gellike layers of hydroxides of barium or strontium. The activity formed gelled layers to a significant extent can be controlled by introducing surfactants in the wet grinding. © 2015 Sumy State University.


Kostishin V.G.,Moscow Institute of Steel And Alloys | Andreev V.G.,Kuznetsk Institute of Information and Management Technologies | Timofeev A.V.,Moscow Institute of Steel And Alloys
Inorganic Materials | Year: 2016

We have examined the feasibility of obtaining polycrystalline barium hexaferrite with multiferroic properties. It has been shown that doping with boron trioxide ensures the formation of a fine-grained structure with high-resistivity nonmagnetic layers between the grains. Such a structure, in combination with texture, ensures pronounced multiferroic properties after exposure of the barium hexaferrite to an external magnetic field. © 2016 Pleiades Publishing, Ltd.


Kostishin V.G.,Moscow Institute of Steel And Alloys | Andreev V.G.,Kuznetsk Institute of Information and Management Technologies | Korovushkin V.V.,Moscow Institute of Steel And Alloys | Chitanov D.N.,Moscow Institute of Steel And Alloys | And 5 more authors.
Inorganic Materials | Year: 2014

2000NN Ni-Zn ferrites have been produced by radiation-enhanced thermal sintering. Mössbauer spectroscopy and X-ray diffraction have been used to investigate general aspects of phase transformations during the radiation-enhanced thermal sintering of green compacts. We have studied distinctive features of the phase transformations that occur during the radiation-enhanced thermal sintering of green compacts prepared from a starting oxide mixture (short procedure) and from ferrite powder presynthesized from oxides. The effect of basic composition on the electromagnetic properties of ferrite products has been examined. The addition of surfactants has been shown to be effective in raising the density of green compacts and improving the performance of the ferrites. © 2014 Pleiades Publishing, Ltd.


Kostishin V.G.,Moscow Institute of Steel And Alloys | Korovushkin V.V.,Moscow Institute of Steel And Alloys | Panina L.V.,Moscow Institute of Steel And Alloys | Andreev V.G.,Kuznetsk Institute of Information and Management Technologies | And 4 more authors.
Inorganic Materials | Year: 2014

2500NMS2 Mn-Zn ferrites have been produced by radiation-enhanced thermal sintering. We have studied the effect of basic ferrite composition and doping on the electromagnetic properties of ferrite products after radiation-enhanced thermal sintering. The results demonstrate that doping with bismuth oxide as a low-melting-point material allows one to activate sintering processes, thereby improving the performance of the material. Mössbauer spectroscopy and X-ray diffraction have been used to investigate general aspects of phase transformations during the radiation-enhanced thermal sintering of green compacts. The addition of surfactants is shown to be effective in raising the density of green compacts and improving the performance of the ferrites. © 2014 Pleiades Publishing, Ltd.


Andreev V.G.,Kuznetsk Institute of Information and Management Technologies | Menshova S.B.,Kuznetsk Institute of Information and Management Technologies | Klimov A.N.,Kuznetsk Institute of Information and Management Technologies | Vergazov R.M.,Kuznetsk Institute of Information and Management Technologies
Journal of Magnetism and Magnetic Materials | Year: 2015

This work deals with the research into the electromagnetic properties of Ni-Zn ferrite radio-absorbing materials obtained by the ceramic method under different technological conditions. There has been ascertained the influence of basic composition and microstructures on the level of absorption of electromagnetic radiation by Ni-Zn ferrite radio-absorbing materials. The results indicate that increasing the surplus Fe2O3 up to 51.0 mol% leads to a shift in frequency interval in the direction of low frequencies. It can be explained by increase of the permeability and permittivity of a ferrite. © 2015 Elsevier B.V. All rights reserved.


Kostishin V.G.,Moscow Institute of Steel And Alloys | Andreev V.G.,Kuznetsk Institute of Information and Management Technologies | Panina L.V.,Moscow Institute of Steel And Alloys | Chitanov D.N.,Moscow Institute of Steel And Alloys | And 3 more authors.
Inorganic Materials | Year: 2014

Mg-Zn ferrites comparable in performance to 600NN Ni-Zn ferrite have been produced by radiation-enhanced thermal sintering. We have studied the effect of their basic composition and doping on their electromagnetic properties. The results demonstrate that doping with bismuth oxide as a low-melting-point material allows one to activate sintering processes, thereby improving the performance of the material. The addition of surfactants is shown to be effective in raising the density of green compacts for the preparation of the ferrites. © 2014 Pleiades Publishing, Ltd.

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