Gibbs free energy of formation of Cu2In2O5 ternary phase determined by E.M.F. method
Employing electrochemical cells with the solid zirconia electrolyte: Cu2O,CuO/O2-/air Cu2In2O5, In2O3,Cu2O/O2-/air In,In2O3/O2-/Ni, NiO Gibbs free energy of formation of solid Cu2In2O5 phase as well as that for In2O3 and CuO oxides was determined in the temperature range from 973 K to...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Belgrade, Technical Faculty, Bor
2022-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2022/1450-53392200030J.pdf |
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| Summary: | Employing electrochemical cells with the solid zirconia electrolyte:
Cu2O,CuO/O2-/air Cu2In2O5, In2O3,Cu2O/O2-/air In,In2O3/O2-/Ni, NiO
Gibbs free energy of formation of solid Cu2In2O5 phase as well as that for
In2O3 and CuO oxides was determined in the temperature range from 973 K to
1372 K. The results obtained in this study were used to derive Gibbs free
energy change of the reaction of formation of the ternary compound from
respective oxides: 2CuO + In2O3 = Cu2In2O5 which is equal to:
ΔGf0,Cu2In2O5 = 33905 − 41.50T (±3600) Jmol−1. Standard
enthalpy of formation from elements ΔH0f,298 and standard enthalpy ΔS0298
derived for Cu2In2O5 phase by Second Law sigma plot are -1211 (±15) kJ
mol-1 and 493.20 (±10) J (K-1 mol-1). Oxygen potential diagrams for the
Cu-In-O system are also given at two temperatures. |
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| ISSN: | 1450-5339 2217-7175 |