Electrochemical and Spectroscopic Studies of Molten Halides
Final rept. 15 Sep 1988-14 Nov 1992
TENNESSEE UNIV KNOXVILLE DEPT OF CHEMISTRY
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This program deals with chemistry and electrochemistry in molten halides, media which are used in the production of several important elements, such as aluminum, magnesium and fluorine, in some high energy battery systems, as well as in other applications. The emphasis was placed on simple and complex chlorides and fluorides, for example the LiCl-KCl eutectic, the LiF-NaF-KF eutectic FLINAK, alkali metal and organic tetrachloroaluminates, and cryolite. Pure fluorides usually have high melting points, for example cryolite, Na3AlF6, melts at 1000 deg C compared to NaAlCl4 which melts at 156 deg C. The use of molten mixtures of fluorides and chlorides can result in solute chemistry which is quite different from that observed in pure chloride. One complication which cannot be entirely avoided is caused by atmospheric contaminants. Even the parent alkali chloroaluminates contain millimolar quantities of complexed oxide which may result from the interaction of some melts with Pyrex glass. Therefore, studies of solute species at typical electrochemical or spectroscopic concentrations should take into account the presence of oxide species wherever possible.
- Inorganic Chemistry
- Physical Chemistry