Electrochemical behaviour of lanthanum fluoride in molten fluorides

Ambrová, Marta, Jurišová, Jana and Danielik, Vladimír Electrochemical behaviour of lanthanum fluoride in molten fluorides Chemical Papers, Vol.62, No. 6, 2008, 559-565

Document type: Článok z časopisu / Journal Article
Collection: Chemical papers  

Author(s) Ambrová, Marta
Jurišová, Jana
Danielik, Vladimír
Title Electrochemical behaviour of lanthanum fluoride in molten fluorides
Journal name Chemical Papers
Publication date 2008
Year available 2008
Volume number 62
Issue number 6
ISSN 0366-6352
Start page 559
End page 565
Place of publication Poland
Publisher Versita
Collection year 2008
Language english
Subject 250000 Chemical Sciences
250200 Inorganic Chemistry
Abstract/Summary The electrochemical behaviour of lanthanum fluoride dissolved in molten lithium fluoride and in eutectic mixture LiF-CaF2 was investigated by cyclic voltammetry and laboratory electrolysis. The cyclic voltammetry experiments were carried out at 900°C and 800°C, respectively, in a graphite crucible (counter electrode). Several types of working electrodes (Mo, W, Ni and Cu) were used. Ni/Ni(II) was used as a reference electrode. Laboratory electrolysis was carried out in the system LiF-CaF2-LaF3 at 800°C in galvanostatic (j c = −0.21 A cm−2) and potentiostatic (E = 0.87 V) regimes. In both cases, nickel served as the cathode and graphite as the anode. It was found that no new separate reduction peak occurred on the molybdenum or tungsten electrodes in the investigated systems. When copper or nickel electrodes were used, new peaks corresponding to the reduction of lanthanum(III) to lanthanum metal appeared. This can be explained by the formation of alloys or intermetallic compounds of lanthanum with copper or nickel. X-ray microanalysis showed that lanthanum was electrodeposited together with calcium under formation of intermetallic compounds with the electrode materials in the galvanostatic regime. In the potentiostatic regime, mainly lanthanum was deposited, which enabled its separation.
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