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Интеллектуальная Система Тематического Исследования НАукометрических данных |
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The Mössbauer study of Fe/Co nanotubes obtained on the base of track membranesтезисы доклада
- Авторы: Kozlovskiy A., Zhanbotin A., Zdorovets M., Manakova I., Ozernoy A., Kadyrzhanov K., Rusakov V.
- Сборник: International Conference on the Applications of the Mossbauer Effect ICAME 2015 - Book of Abstracts
- Тезисы
- Год издания: 2015
- Место издания: Hamburg, Germany
- Первая страница: 204
- Последняя страница: 204
- Аннотация: At present, the nanostructures are in a great scientific interest due to their special mechanical, optical, and electromagnetic properties in comparison with bulk materials of the same composition. All the specific properties of such structures are due to quantum phenomena and size effects [1]. One of the most efficient methods of nanostructures producing is the template synthesis in which the porous materials are used as matrix. This method allows the synthesis of nanoscale objects of various shapes and sizes which can be accurately controlled. The track membranes obtained by irradiating on the DC-60 accelerator using the krypton ions with an energy of 1.75 MeV/nucleon with a fluency of 1,0 109 sm-2 and the Hostaphan® polyethylene terephthalate films were used as the matrix for the iron and cobalt nanotubes template synthesis. After the chemical etching, the pores' diameters were 110 ± 5 nm [2-3]. The following electrolyte composition was used for electrochemical deposition of metals: СоSO4×7H2O (110 g/l), FeSO4×7H2O (110 g/l), H3BO3 (25 g/l) С6Н8О6 (3 g/l), at a voltage of 1.5 V and 2.0 V in a potentiostatic mode at room temperature. The SEM and TEM techniques proved that the obtained nanostructures are nanotubes with the length of 12 mm, diameter of 110±5 nm and the thickness of 20 nm. The EDA analysis of the spectra showed that the atomic ratio of metals in nanotubes was Fe58/Co42 for 1.5 V and Fe49/Co51 for 2.0 V respectively. The X-ray studies demonstrated that the samples had the singlephase and the BCC structure with a lattice parameter a ≈ 2,850 Å. The nanotubes for the Mössbauer studies were patterned in a polymer matrix. The samples were placed so that the nanotubes' axis were parallel to the γ-rays' direction [4]. The decoding model method implemented in the SpectrRelax software was applied for the Mössbauer spectra processing [4]. The obtained Mössbauer spectra of 57Fe nuclei in Fe/Co nanotubes were the Zeeman sextets with inhomogeneously broadened lines with nonequivalent positions of the iron atoms in the nanotube structure. The average value of the hyperfine magnetic field at the 57Fe nuclei was 356.2±0.4 kOe for Fe58/Co42 and 354.2±0.5 kOe for Fe49/Co51. The analysis of the spectra proved that the values of the hyperfine field at the 57Fe nuclei increased with the rising of the Co atoms number in the immediate environment of the Fe atoms. Substitution of the one iron atom for the cobalt atom led to increasing of the hyperfine magnetic field at 8.9±0.4 kOe for Fe58/Co42 and 9.0±0.4 kOe for Fe49/Co51. Thus, a shift of the Mossbauer line was reduced to 0.004±0.002 mm/c. The intensity ratio of the second and the fifth lines to the first and the sixth lines of the observed Zeeman sextet I2,5/I1,6 = 0.23±0.02 and I2,5/I1,6 = 0.18±0.02 for the observed samples indicated the existence of a magnetic texture with the prevailing direction along the nanotubes axis.
- Добавил в систему: Русаков Вячеслав Серафимович