Electrochemistry of Niobium in Rubidium and Caesium Halide and Oxohalide Melts, and the Electrochemical Synthesis of Novel Niobium Compounds

Grinevitch, V.V.; Arakcheeva, A. V.; Kuznetsov, S. A.

doi:10.1007/978-94-010-0127-4_20

Cited by 6 publications

(13 citation statements)

References 7 publications

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“…Tantalum of this modification could be apparently prepared only in the presence on an electric field: by direct current magnetron sputtering [11] or using the electrodeposition from molten salts [12,13]. The structure of ␤-Ta was described in detail in our publication [14]:…”

Section: Phase Composition Of Electrolysis Productsmentioning

confidence: 99%

“…As to metallic tantalum, it mainly crystallized in the cubic modification. In any event, the metastable phase of ␤-Ta, even deposited at the cathode, should quickly transform to the thermodynamically stable ␣-Ta phase at such high temperature [13]. Fig.…”

Section: Phase Composition Of Electrolysis Productsmentioning

confidence: 99%

“…Their using removes the possibility to determine the specific role played by each outer-sphere cation of the solvent in an electrochemical process. Meanwhile, our study of niobium-containing salt systems [5,6] showed that this role may be very important and even decisive. It was demonstrated that varying the outer-sphere cation composition is a powerful tool to control the chemical and phase composition of electrolysis products.…”

Section: Introductionmentioning

confidence: 99%

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Electrode and chemical reactions during electrodeposition of tantalum products in CsCl melt

Grinevitch

Kuznetsov

Arakcheeva

et al. 2006

Electrochimica Acta

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This work was accomplished in the context of systematic examination of a role played by electrolyte cation composition in electroreduction processes. The electrochemical behaviour of molten salts systems where CsCl was used as solvent for potassium and caesium oxyfluorotantalates was investigated. In particular, the influence of the electrolysis parameters, such as concentration of tantalum species in electrolyte, temperature and current density on the cathodic products phase composition was determined by X-ray diffraction and scanning electron microscopy. Several phases generally crystallized at the cathode simultaneously. Among identified phases were metallic tantalum in cubic (␣) and tetragonal (␤) crystal modifications and TaO. But the most characteristic phases for the melt under study were two isostructural compounds with pyrochlor type crystal lattice CsTa 2+z 5 O 5+y F 1−y and CsTa 2+z 5−x O 5+y F 1−y . The former deposited in the form of transparent dielectric crystals and the later -in the form of metal-like conductive ones. This latter compound seems to be synthesized for the first time. The peculiarities of its structure were described. Electrochemical redox processes in melts containing potassium oxyfluorotantalates dissolved in CsCl were studied by cyclic voltammetry. Three discharge peaks were detected on voltammograms in the temperature range 700-850 • C. They were associated with the discharge of TaOF 6 3− and TaO 2 F 4 3− complexes and alkali metal cations.

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Section: Phase Composition Of Electrolysis Productsmentioning

confidence: 99%

Section: Phase Composition Of Electrolysis Productsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrode and chemical reactions during electrodeposition of tantalum products in CsCl melt

Grinevitch

Kuznetsov

Arakcheeva

et al. 2006

Electrochimica Acta

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“…(ii) Tetragonal β-Ta, which can be obtained only in the presence of an electric field: by magnetron sputtering 13 or by electrolysis of molten salts. 14,15 (iii) TaO, the lower tantalum oxide with orthorhombic crystal lattice obtained at high temperature and pressure. 16 (iv) Two different types of octahedral crystals with similar compositions CsTa 2+z n+ O 5+y F 1−y .…”

Section: Resultsmentioning

confidence: 99%

“…In this paper, the attention will be paid only to electrocrystallization of TaO because electrochemical synthesis of nanomaterials [18][19][20] and high-pressure phases 15,21,22 is in the focus of our studies.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Synthesis of Nanomaterials in Molten Salts

Kuznetsov

2017

J. Electrochem. Soc.

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Cathodic processes in the CsCl-K 3 TaOF 6 melt were studied in the temperature range 650-850 • C by cyclic voltammetry. It was shown that electrolysis of the CsCl-K 3 TaOF 6 melt led to the formation of several phases containing tantalum on the molybdenum cathode. The variations of the cathodic products at different concentrations of K 3 TaOF 6 and temperatures were determined. It was found that TaO crystallizes at the cathode as nanoneedles to 1200 nm in length with a cross-section around of 100 nm together with other tantalum compounds. Monoxide of tantalum was obtained by electrolysis of molten salts only at temperatures below 810 • C. Monoxide of tantalum is a high-pressure phase, so it was confirmed once more by electrolytic synthesis of TaO that an effect similar to the action of high pressure occurs during electrolysis.

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Standard charge transfer rate constants for Nb(V)/Nb(IV) redox pairs in fluoride melts

Popova¹,

Kuznetsov²

2012

Russ J Electrochem

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Electrochemistry of Niobium in Rubidium and Caesium Halide and Oxohalide Melts, and the Electrochemical Synthesis of Novel Niobium Compounds

Cited by 6 publications

References 7 publications

Electrode and chemical reactions during electrodeposition of tantalum products in CsCl melt

Electrode and chemical reactions during electrodeposition of tantalum products in CsCl melt

Electrochemical Synthesis of Nanomaterials in Molten Salts

Standard charge transfer rate constants for Nb(V)/Nb(IV) redox pairs in fluoride melts

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