An in-situ Raman spectroscopic study on potential-pO2-phase diagram of lanthanum in LiCl-KCl eutectic melt

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The oxidative reaction between lanthanum trichloride and oxide ion was studied in the molten LiCl-KCl eutectic at 773 K by in-situ Raman spectroscopy using an yttria-stabilized zirconia electrode in conjunction with electrochemical methods. The formation of lanthanum oxychloride, LaOCl(s), was confirmed by studying the vibrational properties of crystalline LaOCl and X-ray diffraction analysis. The solubility product of LaOCl in the LiCl-KCl molten eutectic at 773 K is found to be pKsp(LaOCl) = 7.569 ± 0.100, by combining the results of Raman spectroscopy and potentiometric titration with the addition of barium oxide. The use of Raman spectroscopic quantitation of dissolved lanthanum ions in the system allows faster and more accurate determination of the stable phase of lanthanum as well as the solubility product of LaOCl compared with that measured by potentiometric titration only. Based on experimentally obtained pKsp and standard equilibrium potentials, the potential-pO2− phase diagram of lanthanum in the molten LiCl-KCl eutectic was reported.
Publisher
ELSEVIER
Issue Date
2020-07
Language
English
Article Type
Article
Citation

JOURNAL OF RARE EARTHS, v.38, no.7, pp.793 - 800

ISSN
1002-0721
DOI
10.1016/j.jre.2019.06.008
URI
http://hdl.handle.net/10203/275493
Appears in Collection
NE-Journal Papers(저널논문)
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