Studies of niobium electrocrystallization phenomena in molten fluorides

Journal Article · Wed May 01 04:00:00 EDT 1996 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1836681· OSTI ID:256810

Chamelot, P; Lafage, B; Taxil, P ^[1]

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1. Univ. Paul-Sabatier, Toulouse (France). Lab. de Genie Chimique et Electrochimie

The electrodeposition of niobium from NbCl{sub 5} or K{sub 2}NbF{sub 7}, dissolved in molten alkaline fluorides (LiF/NaF), in the 700--800 C temperature range has been studied by using cyclic voltammetry, chronopotentiometry, and chronoamperometry. A linear relationship between the Nb{sup IV} diffusion coefficient and the temperature was found in the cyclic voltammograms and chronopotentiograms. Scanning electron micrography shows that the shape of the nuclei is hemispherical. Chronoamperometric results show that the deposition process involves instantaneous nucleation with diffusion-controlled growth of the nuclei. The influence of temperature, overpotential, and substrate (copper, stainless steel, vitreous carbon) on the nuclear site densities is also considered.

• Sponsoring Organization: USDOE
• OSTI ID: 256810
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 5 Vol. 143; ISSN 0013-4651; ISSN JESOAN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHEMICAL REACTION KINETICS
ELECTRODEPOSITED COATINGS
ELECTRODEPOSITION
MOLTEN SALTS
NIOBIUM
NIOBIUM CHLORIDES
NIOBIUM FLUORIDES
POTASSIUM CHLORIDES