Abstract
The e.m.f.'s of the following solid-oxide electrolyte galvanic cells have been measured over the temperature ranges shown. FeMoO 3, Fe 3Mo 2, Fe 0.933MO 0.067|O 2−|Fe 0.947O, Fe, (1240 to 1320 K), (1) FeMoO 3, Fe 2Mo, Fe 0.95MO 0.05|O 2−|Fe 0.947O, Fe, (1168 to 1232 K), (2) FeMoO 3, Fe 3Mo 2, Fe 2MO |O 2−|Fe 0.947O, Fe, (1160 to 1222 K), (3) FeMoO 3, Fe 3Mo 2, MO |O 2−|Fe 0.947O, Fe, (1276 to 1366 K), (4) The results have been used to obtain the standard Gibbs energies, enthalpies, and entropies of formation of Fe 2Mo, Fe 3Mo 2, and molybdate FeMoO 3 in the temperature ranges of investigation. The thermodynamic quantities for Fe 2Mo and Fe 3Mo 2 are compared with those of isostructural phases in the Fe + W, Co + Mo, and Co + W systems.
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