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Thermodynamic and electrochemical properties of holmium and HoxAly intermetallic compounds in the LiCl-KCl eutectic
Liu K(刘奎); Liu YL(刘雅兰); Yuan LY(袁立永); Wang L(王璐); Wang L(王琳); Li ZJ(李子杰); Chai ZF(柴之芳); Shi WQ(石伟群); Liu, K; Liu, YL; Yuan, LY; Wang, L; Wang, L; Li, ZJ; Chai, ZF; Shi, WQ
2015
Source PublicationELECTROCHIMICA ACTA
ISSN0013-4686
EISSN1873-3859
Volume174Pages:15-25
Corresponding Author石伟群
SubtypeArticle
AbstractThis work presents a study of electrochemistry of holmium in the LiCl-KCl eutectic by applying a series of electrochemical techniques on a tungsten electrode at the temperature range of 684-809K. The reduction of Ho(III) cations in the LiCl-KCl eutectic is a one step process with the transfer of three electrons. The diffusion coefficients of the Ho(III) is temperature dependent and can be expressed asInD(Ho(lll)) = 4461T(-1) -5.498. The activation energy for the diffusion of Ho(III) in the LiCl-KCl eutectic was also calculated to be 37.09 kJ/mol. The apparent standard potential of Ho(III) can be described asE(HO)((III)/Ho)(theta) (vs.Cl-2/Cl-1) = -3.450 + 5.789 x 10(-4)T/V and the apparent Gibbs free energy for the formation of HoCl3 in the LiCl-KCl eutectic can be expressed as: Delta G(HoCl3)(theta) (vs. Cl-2/Cl-1) = 998.62 + 0.1676T (kJ/mol). The thermodynamic properties of six AlyHox intermetallic compounds were determined by open circuit chronopotentiometry (OCP) at the temperature of 723 and 773 K. AlyHox intermetallic compound samples were prepared by potentiostatic electrolysis in the LiCl-KCl-AlCl3Ho2O3 and LiCl-KCl-HoCl3 melts on an aluminium electrode at 773 K, respectively. Scanning Electron Microscopy coupled with Energy Dispersive Spectroscopy (SEM-EDS) and X-ray diffraction (XRD) characterizations identified the formation of three intermetallic compounds (Al17Ho2, Al3Ho and Al2Ho). As far as we know, this is the first time that intermetallic compound Al17Ho2 was obtained by an electrochemical method. (C) 2015 Elsevier Ltd. All rights reserved.
KeywordElectrochemistry Holmium HoxAly intermetallic compounds LiCl-KCl eutectic
Subject AreaElectrochemistry
DOI10.1016/j.electacta.2015.05.161
Indexed BySCI ; EI ; CA
Language英语
WOS Research AreaElectrochemistry
WOS SubjectElectrochemistry
WOS IDWOS:000359873400003
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Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/228653
Collection院士
多学科研究中心
Recommended Citation
GB/T 7714
Liu K,Liu YL,Yuan LY,et al. Thermodynamic and electrochemical properties of holmium and HoxAly intermetallic compounds in the LiCl-KCl eutectic[J]. ELECTROCHIMICA ACTA,2015,174:15-25.
APA 刘奎.,刘雅兰.,袁立永.,王璐.,王琳.,...&Shi, WQ.(2015).Thermodynamic and electrochemical properties of holmium and HoxAly intermetallic compounds in the LiCl-KCl eutectic.ELECTROCHIMICA ACTA,174,15-25.
MLA 刘奎,et al."Thermodynamic and electrochemical properties of holmium and HoxAly intermetallic compounds in the LiCl-KCl eutectic".ELECTROCHIMICA ACTA 174(2015):15-25.
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