Evaluation of High-Frequency Superconductivity of Niobium Coatings Prepared by Electrodeposition in Molten Salts

Колосов, В. Н.; Matychenko, E. S.

doi:10.1007/978-94-015-9135-5_25

Cited by 7 publications

(4 citation statements)

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“…No mention is made of Nb 3 Sn coatings. More recently, some authors proposed the synthesis of Nb 3 Sn coatings by electrodeposition [18,19] and by galvanic displacement of Nb in molten salts containing SnCl 2 [20]. The main disadvantages of these approaches are that they require temperatures higher than 370 °C and residual pressures no higher than 2.5 Pa in order to remove adsorbed moisture, gases, and residual moisture.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of superconducting Nb₃Sn coatings on Nb substrates

Barzi

Bestetti

Reginato

et al. 2015

Supercond. Sci. Technol.

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In the present work the electrochemical and thermal syntheses of superconducting Nb 3 Sn films are investigated. The Nb 3 Sn phase is obtained by electrodeposition of Sn layers and Cu intermediate layers onto Nb substrates followed by high temperature diffusion in inert atmosphere. Electrodeposition was performed from aqueous solutions at current densities in the 20-50 mA cm −2 range and at temperatures between 40°C and 50°C. Subsequent thermal treatments were realized to obtain the Nb 3 Sn superconductive phase. Glow discharge optical emission spectrometry demonstrated that after thermal treatment interdiffusion of Nb and Sn occurred across a thickness of about 13 μm. Scanning electron microscopy allowed accurately measuring the thickness of the Nb 3 Sn phase, whose average for the various types of film samples was between 5.7 and 8.0 μm. X-ray diffraction patterns confirmed the presence of a cubic Nb 3 Sn phase (A15 structure) having (210) preferred orientation. The maximum obtained T c was 17.68 K and the B c20 ranged between 22.5 and 23.8 T. With the procedure described in the present paper, coating complex shapes cost-effectively becomes possible, which is typical of electrochemical techniques. Furthermore, this approach can be implemented in classical wire processes such as 'jelly roll' or 'rod in tube', or directly used for producing superconducting surfaces. The potential of this method for superconducting radiofrequency structures is also outlined.

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Section: Introductionmentioning

confidence: 99%

Synthesis of superconducting Nb₃Sn coatings on Nb substrates

Barzi

Bestetti

Reginato

et al. 2015

Supercond. Sci. Technol.

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“…[3][4][5][6][7][8] In addition, niobium coatings are in demand for high-tech devices with the phenomenon of superconductivity. 9,10 Electrodeposition from molten salts is a promising method for producing niobium coatings and articles. The advantages of this method include low equipment and operating costs, production of coatings of the desired composition, thickness, structure, and morphology on substrates of complex shape and large size, as well as high purity of the electrolysis products.…”

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confidence: 99%

“…The advantages of this method include low equipment and operating costs, production of coatings of the desired composition, thickness, structure, and morphology on substrates of complex shape and large size, as well as high purity of the electrolysis products. 2,[6][7][8][9][10][11][12][13][14][15][16] Intensive studies of the mechanism and kinetics of the niobium electrodeposition in molten salts and the effect of electrolysis parameters on the characteristics of Nb coatings began in the 1960s-1970s. [13][14][15][16][17][18][19][20] It was found that pure continuous coherent Nb coatings could be obtained in various halide melts based on alkali metal fluorides, chlorides, and bromides.…”

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confidence: 99%

Electrodeposition of Niobium from the CsBr-KBr-NbBr₃ Melt

Chernyshev

Аписаров

Shmygalev

et al. 2021

J. Electrochem. Soc.

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The CsBr-KBr-NbBr3 melt was proposed as a promising electrolyte for obtaining high-quality niobium coatings. This melt is less aggressive and provides a higher deposition rate of dense Nb layers compared to the fluoride and chloride electrolytes commonly used for electrodeposition of niobium. The effect of temperature and cathode current density during electrodeposition from the CsBr-KBr-NbBr3 melt on the structure and morphology of the Nb coatings was investigated. The conditions for the deposition of thick, dense, well-adherent Nb coatings were found. Cyclic voltammetry was used to study the regularities of the cathode process in the CsBr-KBr (57 mol% CsBr − 43 mol% KBr) - NbBr3 melts containing 0.4, 1.6, and 4.45 wt% Nb in a temperature range of 893 to 1013 K. A two-stage mechanism with the participation of Nb(III) and Nb(II) ions was proposed and the effective diffusion coefficient of niobium cations in the bromide melt was estimated based on a comparison of data obtained by cyclic voltammetry and numerical simulation.

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“…Niobium in the form of thin films and coatings are used in high-tech cryogenic devices using the phenomenon of superconductivity [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Superconducting Niobium Coatings Deposited on Spherical Substrates in Molten Salts

Dubrovskiy¹,

Okunev²,

Макарова³

et al. 2018

Coatings

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Abstract:The interaction of substrates from ceramics, beryllium, and carbopyroceram with the electrolyte for the electrodeposition of niobium coatings was investigated. The corrosion resistance of spherical ceramic and beryllium samples with the protective molybdenum films obtained by magnetron sputtering was studied. The exfoliation of molybdenum film from ceramics and beryllium samples was observed after the experiments due to the interaction of substrates with the melt. It was found that the carbopyroceram did not corrode in the niobium containing melt and this material was chosen as the substrate for the electrodeposition of superconducting niobium coatings. The influence of the oxide ions on the electrochemical behavior of niobium complexes in the NaCl-KCl-NaF-K 2 NbF 7 melt was studied. A special form of the cathode was constructed for the electrodeposition of niobium coatings on spherically shaped substrates. Electrodeposition of the niobium coatings on spheres 10 mm in diameter manufactured from carbopyroceram was carried out at 750 • C with the cathodic current density of 5 × 10 −3 -2 × 10 −2 A·cm −2 and the electrolysis time of 8-12 h. Influence of the cathodic current density on the microstructure of niobium coatings was studied. The roughness, nonsphericity, and superconductive properties of niobium coatings were determined.

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Evaluation of High-Frequency Superconductivity of Niobium Coatings Prepared by Electrodeposition in Molten Salts

Cited by 7 publications

References 7 publications

Synthesis of superconducting Nb₃Sn coatings on Nb substrates

Synthesis of superconducting Nb₃Sn coatings on Nb substrates

Electrodeposition of Niobium from the CsBr-KBr-NbBr₃ Melt

Superconducting Niobium Coatings Deposited on Spherical Substrates in Molten Salts

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Evaluation of High-Frequency Superconductivity of Niobium Coatings Prepared by Electrodeposition in Molten Salts

Cited by 7 publications

References 7 publications

Synthesis of superconducting Nb3Sn coatings on Nb substrates

Synthesis of superconducting Nb3Sn coatings on Nb substrates

Electrodeposition of Niobium from the CsBr-KBr-NbBr3 Melt

Superconducting Niobium Coatings Deposited on Spherical Substrates in Molten Salts

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Synthesis of superconducting Nb₃Sn coatings on Nb substrates

Synthesis of superconducting Nb₃Sn coatings on Nb substrates

Electrodeposition of Niobium from the CsBr-KBr-NbBr₃ Melt