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Your search keyword '"Tumarkin, A. V."' showing total 226 results
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226 results on '"Tumarkin, A. V."'

8. Ferroelectric Composites of BaTiO3 and SrTiO3 with the Low-Melting Additive B2O3.

Author

Tumarkin, A. V., Sinelshchikova, O. Yu., Zigankova, D. I., Tyurnina, N. G., Tyurnina, Z. G., Gagarin, A. G., and Karamov, A. R.

Abstract

The structural and electrical properties were studied in ferroelectric composites based on barium and strontium titanates with the addition of boric anhydride, which were synthesized by low-temperature sintering. The obtained materials are promising for creating electrically controlled metamaterials with bulk ferroelectric inhomogeneities. [ABSTRACT FROM AUTHOR]

Published
2024
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14. Composite Materials Based on Polytetrafluoroethylene with SiO2 and BaTiO3 Inorganic Fillers.

Author

Tumarkin, A. V., Tyurnina, N. G., Tyurnina, Z. G., Sinelshchikova, O. Y., Tsygankova, D. I., Gagarin, A. G., Karamov, A. R., Bogdan, A., and Balabanova, E. A.

Subjects
*COMPOSITE materials, *BARIUM titanate, *POLYTEF, *SILICA, *DIELECTRIC loss, *DIELECTRIC properties
Abstract

Polymer dielectric composites consisting of polytetrafluoroethylene, silicon dioxide and barium titanate mixed in various proportions were successfully synthesized by low-temperature sintering. The structure of the obtained composite samples was studied by the X-ray diffraction, the electron microscopy, and the weight method. Electrical characteristics (dielectric permittivity and losses) of samples were investigated at a frequency of 1 MHz. According to structural analysis, the synthesized samples are a mixture of amorphous polytetrafluoroethylene and silicon dioxide, and crystalline ferroelectric BaTiO3, the ratio of which determines the electrical properties of the composites. Depending on the content of barium titanate, the studied samples show a permittivity from 4 to 6.5 with a dielectric loss level of 0.06–0.14. It is shown that the significant influence on the dielectric properties of the polytetrafluoroethylene/silicon dioxide/barium titanate system is exerted by heat treatment modes. [ABSTRACT FROM AUTHOR]

Published
2023
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27. Ion-plasma deposition of multicomponent films with a given law of composition distribution by thickness

Author

null Trofimov P M., null Platonov R. A., null Komlev А. Е., null Altynnikov A.G., null Tumarkin A. V., null Volpyas V. A., and null Kozyrev A. B.

Abstract

A method is proposed for ion-plasma deposition of thin multicomponent films with the ability to control the component composition in thickness (graded film) with a change in the pressure of the working gas according to a given law. Using the BaxSr1-xTiO3 (BSTO)perovskite-type structure as an example, the calculated (Monte Carlo simulation) and experimental dependences of the component composition of films and their deposition rate on the pressure of the working gas were obtained. As an example, the possibility of deposition of BSTO films with a linear distribution of composition by their thickness. Keywords: ion-plasma deposition, thin multicomponent films, composition control.

Published
2023

32. Cu Metallization of Al 2 O 3 Ceramic by Coating Deposition from Cooled- and Hot-Target Magnetrons.

Author

Kaziev, Andrey V., Kolodko, Dobrynya V., Lisenkov, Vladislav Yu., Tumarkin, Alexander V., Kharkov, Maksim M., Samotaev, Nikolay N., and Oblov, Konstantin Yu.

Subjects
COPPER films, CERAMIC coating, ALUMINUM oxide, COPPER, COPPER oxide films, MAGNETRONS, ZINC oxide films, COPPER oxide
Abstract

We examined the feasibility of alumina substrate metallization by magnetron deposition of copper coatings with thickness of several tens µm for its prospective applications in production of ceramic PCBs and packaging. The films were prepared in magnetron sputtering systems with cooled and thermally insulated (hot) targets. Substrates with different geometries were used, including those with through-holes. Thickness, adhesive properties, and electrical resistivity of produced coatings were analyzed. If the film thickness exceeded ~20 µm, we observed its systematic delamination, unless the dedicated CuxOy sub-layer of was introduced between the substrate and the main Cu film. Intermediate copper oxide films were investigated separately by SEM, EDS, and XRD methods, and deposition conditions for predominant growth of favorable tenorite CuO were determined. Prepared composite two-layer CuO + Cu coatings with total thickness of ~100 µm demonstrated good adhesion to alumina substrates in scratch-testing and performed much better than Cu-only films both in soldering and thermal cycling tests. We discuss an approach for constructing a reliable metallizing coating by plasma-assisted PVD methods that could be beneficial for complex-shaped ceramic PCBs and packaging. [ABSTRACT FROM AUTHOR]

Published
2023
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