Standard Gibbs free energy of formation for Cu 2 O, NiO, CoO, and Fe x O : High resolution electrochemical measurements using zirconia solid electrolytes from 900-1400 K

Details Standard Gibbs free energy of formation for Cu 2 O, NiO, CoO, and Fe x O : High resolution electrochemical measurements using zirconia solid electrolytes from 900-1400 K Standard Gibbs free energy of formation for Cu 2 O, NiO, CoO, and Fe x O : High resolution electrochemical measurements using zirconia solid electrolytes from 900-1400 K

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.2439h&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 50, Issue 11, pp.2439-2452

Physics

12

Scientific paper

Galvanic cells with oxygen-specific solid electrolytes made of calcia-stabilized zirconia have been used to make equilibrium measurements of the standard Gibbs free energy of formation, f G 0 m ,( T ), for copper (I) oxide (Cu 2 O), nickel (II) oxide (NiO), cobalt (II) oxide (CoO), and wüstite (Fe x O) over the temperature range from 900-1400 K. The measured values of f G 0 m at 1300 K are -73950, -123555, -142150, and -179459 J · mol -1 for Cu 2 O, NiO, CoO, and Fe 0.947 O, respectively. The precision of these measurements is ± 30-60 J · mol -1 , and their absolute accuracy is estimated to be ± 100-200 J·mol -1 . Using values of -76.557, -94.895, -79.551, and -71.291 J · K -1 · mol -1 for the entropies of formation, f S m 0 , (298.15 K), the calculated enthalpies of formation, f H m 0 , (298.15 K), are -170508, -240110, -237390, and -266458 J · mol -1 for Cu 2 O, NiO, CoO, and Fe 0.947 O, respectively. These values of f S m 0 (298.15 K) and f H m 0 (298.15 K) are in good agreement with the best available calorimetric measurements.

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