Oxygen Potential in the System UMoO6/UMoO5 by the Solid Oxide Electrolyte Emf Method |
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Authors: | K. Swaminathan C. Mallika O. M. Sreedharan |
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Affiliation: | Materials Development Laboratory, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India |
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Abstract: | The emf of the galvanic cell Pt|UMoO6UMoO5|ZrO2-Y2O3|O2(air, Po2=0.21 atm)|Pt, measured from 776 to 1127 K, was determined to be E = 751.7−0.4909 ±4.3 mV. Using the standard Gibbs energy of formation, fΔG°, for UMoO6 reported in the literature from transpiration studies, the fΔG° for UMoO5 is calculated to be fΔG°〈UMoO5〉=−1816.9+0.3748T±6.0 U-mol−1 The magnitudes of the standard entropies of formation, fΔS°, for UMoO6 and UMoO5 were evaluated from those values reported for the binary oxides which constitute the ternary compounds. |
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