Abstract
The thermal decomposition of dilute solutions of 
in the ternary fluoride eutectic (Li, Na, K)F (FLINAK) at 750°C was studied both by chemical analysis of quenched melts and in situ by a potentiometric method. The carbonate simultaneously vaporizes as 
and decomposes: 
, until a steady state is reached where the major part of the carbonate is retained in the melt. Voltammetric study of the carbonate reduction shows that the reduction is not direct but goes via the prior reduction of alkali metal: (1) 
, (2) 
.