skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Electrochemical studies of uranium and thorium in molten LiF--NaF--KF at 500$sup 0$C

Abstract

Electrochemical studies of U(IV) in molten Lif--NaF-KF (46.5-process at a platinum electrode. The first step is complicated by disproportionation of U(III) to regenerate U(IV); the second step involves formation of uranium metal. Standard electrode potentials with respect to a unit mole fraction Ni(II)/Ni electrode are estimated for the U(IV)/U(III) and U(III)/U couples as --1.41 and -- 1.81V, respectively. These values must be considered tentative because of complications in the electrode process. The voltammetric oxidation of U(IV) at platinum and pyrolytic graphite electrodes in LiF--NaF--KF occurs at ~+ 1.3V vs. a Ni(II) (saturated)/Ni reference electrode. The results point to the disproportionation of electrochemically generated U(V). In voltammetric studies of Th(IV) in molten LiF--NaF--KF at 500 deg C, a reduction wave is obtained at nickel and tungsten electrodes, with a peak potential of --2.02 V (vs. a Ni(II) (saturated)/Ni reference electrode). Analysis indicated that Th(IV) is reversibly reduced to the metal with alloy formation between the deposited thorium and the nickel. A standard electrode potential for the Th(IV)/Th couple in this melt is calculated to be -2.13V vs. a unit mole fraction Ni(II)/Ni electrode. (auth)

Authors:
; ;
Publication Date:
Research Org.:
Univ. of Tennessee, Knoxville
OSTI Identifier:
4370151
NSA Number:
NSA-29-012629
Resource Type:
Journal Article
Journal Name:
J. Electrochem. Soc., v. 121, no. 1, pp. 86-90
Additional Journal Information:
Other Information: Orig. Receipt Date: 30-JUN-74
Country of Publication:
Country unknown/Code not available
Language:
English
Subject:
N40420* -Chemistry-Radiochemistry & Nuclear Chemistry- Properties of Radioactive Materials; *THORIUM- ELECTROCHEMISTRY; *URANIUM- ELECTROCHEMISTRY; CATIONS; HIGH TEMPERATURE; LITHIUM FLUORIDES; MOLTEN SALTS; OXIDATION; POTASSIUM FLUORIDES; POTENTIOMETRY; REDUCTION; SODIUM FLUORIDES; THORIUM COMPOUNDS; URANIUM COMPOUNDS; VOLTAMETRY

Citation Formats

Clayton, F.R., Mamantov, G., and Manning, D.L. Electrochemical studies of uranium and thorium in molten LiF--NaF--KF at 500$sup 0$C. Country unknown/Code not available: N. p., 1974. Web.
Clayton, F.R., Mamantov, G., & Manning, D.L. Electrochemical studies of uranium and thorium in molten LiF--NaF--KF at 500$sup 0$C. Country unknown/Code not available.
Clayton, F.R., Mamantov, G., and Manning, D.L. Tue . "Electrochemical studies of uranium and thorium in molten LiF--NaF--KF at 500$sup 0$C". Country unknown/Code not available.
@article{osti_4370151,
title = {Electrochemical studies of uranium and thorium in molten LiF--NaF--KF at 500$sup 0$C},
author = {Clayton, F.R. and Mamantov, G. and Manning, D.L.},
abstractNote = {Electrochemical studies of U(IV) in molten Lif--NaF-KF (46.5-process at a platinum electrode. The first step is complicated by disproportionation of U(III) to regenerate U(IV); the second step involves formation of uranium metal. Standard electrode potentials with respect to a unit mole fraction Ni(II)/Ni electrode are estimated for the U(IV)/U(III) and U(III)/U couples as --1.41 and -- 1.81V, respectively. These values must be considered tentative because of complications in the electrode process. The voltammetric oxidation of U(IV) at platinum and pyrolytic graphite electrodes in LiF--NaF--KF occurs at ~+ 1.3V vs. a Ni(II) (saturated)/Ni reference electrode. The results point to the disproportionation of electrochemically generated U(V). In voltammetric studies of Th(IV) in molten LiF--NaF--KF at 500 deg C, a reduction wave is obtained at nickel and tungsten electrodes, with a peak potential of --2.02 V (vs. a Ni(II) (saturated)/Ni reference electrode). Analysis indicated that Th(IV) is reversibly reduced to the metal with alloy formation between the deposited thorium and the nickel. A standard electrode potential for the Th(IV)/Th couple in this melt is calculated to be -2.13V vs. a unit mole fraction Ni(II)/Ni electrode. (auth)},
doi = {},
journal = {J. Electrochem. Soc., v. 121, no. 1, pp. 86-90},
number = ,
volume = ,
place = {Country unknown/Code not available},
year = {1974},
month = {1}
}