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The sodium-cerium ternary oxides NaCeO 2 and Na 2 CeO 3 have been shown to be stable in liquid sodium. Their free energies of formation have been measured by emf methods and follow the equationsAt 873 K Na 2 CeO 3 requires high oxygen levels in the sodium for it to be formed but NaCeO 2 will form from Ce 2 O 3 and sodium at reactor operating...