The electrochemical synthesis of europium boride

Bukatova, G. A.; Kuznetsov, S. A.; Gaune‐Escard, M.

doi:10.2298/jmmb0302251b

Cited by 19 publications

(4 citation statements)

References 4 publications

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“…was purified by double melt recrystallization: NaF was dried in a glassy carbon (GC) crucible (brand SU-2000, inner diameter 60 mm, height 150 mm) at 673-773 K under vacuum, then heated up to a temperature 50 K above its melting point and finally cooled down 50 K below the melting point at a rate of 3-4 K h −1 . 22 On being solidified, the salt was transferred at 393 K in a glove box with controlled atmosphere (O 2 and H 2 O content less than 2 ppm) and contaminations were mechanically removed in the glove box.…”

Section: Methodsmentioning

confidence: 99%

Electrodeposition of Tantalum Coatings on Nitinol Stent and Composition of Intermetallic Compounds Forming During Electrolysis

Dubrovskii¹,

Макарова²,

Kuznetsov³

2021

J. Electrochem. Soc.

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The electroreduction of tantalum complexes in a chloride-fluoride melt was studied on tungsten, and nitinol electrodes. It was found that on a nitinol electrode in addition to the peak associated with the discharge of fluoride tantalum complexes, several peaks on the voltammogram related to the formation of intermetallic compounds of nickel and tantalum were observed. The electrodeposition of tantalum coatings from the NaCl-KCl-NaF(10 wt.%)-K2TaF7(10 wt.%) melt onto nitinol stent was investigated. The formation during electrolysis of several intermediate layers between the deposited layer and substrate was found and their microstructure and chemical composition were determined. It was determined that the surface layers of the nitinol are depleted in titanium due to corrosion in the melt. During electrodeposition a barrier intermetallic layer TiNi2.4Ta0.6 is formed, which prevents the penetration of tantalum into the substrate, but does not prevent the diffusion of nickel and titanium from the substrate into the deposited layer of tantalum.

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Section: Methodsmentioning

confidence: 99%

Electrodeposition of Tantalum Coatings on Nitinol Stent and Composition of Intermetallic Compounds Forming During Electrolysis

Dubrovskii¹,

Макарова²,

Kuznetsov³

2021

J. Electrochem. Soc.

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“…The solidified salts were transferred at 393 K to a dry glove box and impurities were removed mechanically. 22 Potassium heptafluoroniobate and heptafluorotantalate were prepared by recrystallization of extra pure salt (content of metallic impurities of 10 -3 wt%; manufactured by the workshop of the Tananaev Institute of Chemistry) from hydrofluoric acid solutions followed by washing with ethanol and drying in a vacuum oven at 383-393 K.…”

Section: Methodsmentioning

confidence: 99%

Influence of the Second Coordination Sphere on the Roughness of Niobium and Tantalum Coatings Obtained in Chloride-Fluoride Melts

Kuznetsov

2020

J. Electrochem. Soc.

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The influence of the second coordination sphere complexes on the roughness of niobium and tantalum coatings was studied. It was found that the discharge potential of niobium oxofluoride complexes has a more positive potential than fluoride ones in the NaCl-KCl-NaF (10 wt%)-K 2 NbF 7 melt. For the СsCl-CsF (10 wt%)-CsNbF 6 molten system the inversion of potentials corresponding to discharge of oxofluoride and fluoride complexes was observed. Due to micropassivation by oxygen impurities as niobium suboxides and oxygen-niobium solid solution the coating roughness in the NaCl-KCl-NaF (10 wt%)-K 2 NbF 7 (8 wt%) melt diminishes in comparison with СsCl-CsF (10 wt%)-CsNbF 6 (8 wt%) melt. In molten salts NaCl-KCl-NaF (10 wt%)-K 2 TaF 7 and СsCl-CsF (10 wt%)-CsTaF 6 tantalum oxofluoride complexes are discharged at more negative potentials than fluoride ones and changes in the composition of the second coordination sphere from sodium to cesium led to a lower level of roughness. For melts containing in the second coordination sphere cesium cations, the roughness of the tantalum coatings was less than that of niobium due to the greater strength of the fluoride complexes of tantalum. It was found that pulsed current electrolysis for deposition of niobium and tantalum coatings has significant advantages in comparison with direct current electrolysis.

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“…Sodium fluoride was purified by double recrystallization from a melt: NaF was dried at 400-500 °C in a vacuum and then heated to a temperature 50 °C higher than the melting point, kept at this temperature for several hours, and then slowly cooled at a rate of 3-4 deg min -1 to a temperature 50 °C lower than the melting point (8). On being solidified, the salt was transferred at 120 °C in a glove box with controlled atmosphere (O 2 and H 2 O content less than 2 ppm) and contaminations were mechanically removed in the glove box.…”

Section: Methodsmentioning

confidence: 99%