An in-situ Raman spectroscopic study on potential-pO~(2-) phase diagram of lanthanum in LiCl-KCl eutectic melt |
| |
| Affiliation: | 1. Department of Nuclear and Quantum Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, South Korea;2. Nonproliferation System Research Division, Korea Atomic Energy Research Institute, 111 Daedeok-daero 989beon-gil, Yuseong-gu, Daejeon 34057, South Korea;1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Key Laboratory of Nuclear Radiation and Nuclear Energy Technology, Chinese Academy of Sciences, Shanghai 201800, China;4. Center of Excellence TMSR Energy System, Chinese Academy of Sciences, Shanghai 201800, China;1. Key Laboratory of Nuclear Radiation and Nuclear Energy Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;2. Department of Radiochemistry, China Institute of Atomic Energy, Beijing, 102413, China;3. Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China |
| |
| Abstract: | 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. |
| |
| Keywords: | Lanthanum Solubility product Raman spectroscopy Chloride molten salt Rare earths |
| 本文献已被 CNKI ScienceDirect 等数据库收录！ |
|
