Abstract
A study has been made of the BaF2-BaC2 system for use as a solid electrolyte applicable to measurements of the chemical potential of carbon. From lattice parameter studies of annealed specimens it is concluded that only a limited solid solubility exists; rising from about 0.8 to 1.0 wt pct BaC2 in the temperature interval 973 to 1173 K. Hydrolysis of the solid solutions produced gases containing two carbon atoms with no evidence of single carbon hydrocarbons. This is taken as evidence that the acetylide ion,C 2- 2, of BaC2 is conserved in the solid solution. Galvanic cell studies with Mo-Mo2C and Cr-Cr23C6 electrodes in the temperature range 890 to. 1105 K with electrolytes of differing composition gave results in excellent accord with the most recent measurements of the stabilities of the carbides. Lack of reversibility to graphite indicates a limited application of the electrolyte.
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