Electrical Conductivity of Fused Sodium Chloride-Calcium Chloride Mixtures

Story, Joseph B.; Clarke, J. T.

doi:10.1007/bf03377943

Cited by 2 publications

(1 citation statement)

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“…An addition of NaCl to the CaCl 2 melt can lower the liquidus temperature and increase the electrical conductivities of the electrolyte; importantly, it can reduce the CaO solubility and prevent niobium oxides from dissolving chemically into the melt in the case of the CaO-dissolved CaCl 2 melts. 14,35 The variations of theoretical decomposition potentials of the pure salts, niobium oxides, and calcium niobate present in the system with temperature are illustrated in Fig. 1, with those for CaO also included in the figure for comparison.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Studies on Reduction of Solid Nb[sub 2]O[sub 5] in Molten CaCl[sub 2]-NaCl Eutectic

Xiao¹,

Fray²

2005

J. Electrochem. Soc.

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Cathodic processes during the electrodeoxidation of solid Nb 2 O 5 in thermally dried and pre-electrolyzed molten CaCl 2 -NaCl eutectic were studied at temperatures 850-950°C using cyclic voltammetry and chronoamperometry, respectively. In cyclic voltammograms at 850-950°C, several reduction peaks were clearly observed at the potentials at least 0.8 V vs ͑Na + , Ca 2+ ͒/͑Na-Ca͒ less cathodic than those of the metals deposition from the eutectic melt, confirming the concept of cathodic oxygen ionization. The chronoamperometric studies showed that the cathodic processes at the potentials of 0.7-0.2 V vs ͑Na + , Ca 2+ ͒/͑Na-Ca͒ always started with the oxygen ionization of the CaNb 2 O 6 film on the surface of the Nb 2 O 5 electrode in the molten CaCl 2 -NaCl eutectic electrolyte, which was governed by the oxygen diffusion within the film toward the CaNb 2 O 6 -electrolyte interface. The subsequent oxygen ionization of the oxides at the surface took place consecutively and/or simultaneously. Surface characterizations of the Nb 2 O 5 electrodes before and after the chronoamperometric measurements revealed that there existed a marked dependence of the morphologies, compositions, and phases on the imposed potential steps and that the calcium cations were intercalated electrochemically into the Nb 2 O 5 structure at the surface at relatively less cathodic potentials than that of the sodium deposition from the molten CaCl 2 -NaCl eutectic.

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Section: Resultsmentioning

confidence: 99%