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Abstract
The equilibrium solubility of NiO, CuO, ZnO, LiFeO/sub 2/, and LaNiO/sub 3/ in binary Li/K carbonate was quantitatively measured between 823 and 1223 K under a simulated molten carbonate fuel cell cathode environment. The solubility of all materials, except LaNiO/sub 3/, was found to increase with increasing temperature. Equilibrium solubilities at 923 K, the operating temperature of a molten carbonate fuel cell, were determined to be 13 X 10/sup -6/, 32 X 10/sup -6/, 63 X 10/sup -6/, and 16 X 10/sup -6/ mole fraction for NiO, CuO, ZnO, and LiFeO/sub 2/, respectively. The LaNiO/sub 3/ solubility remained below the quantitative detection limit until the melt's temperature exceeded 1123 K, at which time material decomposition was detected.
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