Small additions of alkaline earth carbonates such as MgCO3, CaCO3, BaCO3 and SrCO3 to (Li0.62K0.38)2CO3 can change the basicity, defined as -log(aM2O), where M represents an alkali metal and aM2O is the net oxide ion activity. Net oxide ion activity is defined as the sum of the alkali and alkaline earth oxides activities dissolved in the melt. If the effect of the alkaline earth additive were to change the basicity of the solvent melt, it ought to be possible to measure that change by a galvanic cell. Therefore, a single zirconia electrolyte cell arrangement has been devised to measure basicity changes at 650°C, as follows: CO2,O2, Au, (Li0.62K0.38)2CO3|ZrO2 · Y2O3|test melt, Au, Ar Overall, the agreement between the thermodynamic model for this cell and the measured cell voltages is reasonably good. To complete the analysis, it was necessary to measure NiO solubilities in (Li0.62K0.38)2CO3 melts containing MgCO3 and SrCO3 additions. The cell measurements of basicity and the solubilities are self-consistent.
|Original language||English (US)|
|Number of pages||7|
|Journal||Zeitschrift fuer Metallkunde/Materials Research and Advanced Techniques|
|State||Published - Oct 1 1997|