Gibbs free energy of formation of Cu2In2O5 ternary phase determined by E.M.F. method
J. Min. Metall. Sect. B-Metall., 58 (3) (2022) 491-500. DOI:10.2298/JMMB220614030J
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Available online 22 November 2022
(Received 14 June 2022; Accepted 09 November 2022)
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Abstract
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: ∆G_(f,〖Cu〗_2 〖In〗_2 O_5)^0=33905-41.50T (±3600) “J ” 〖mol〗^(-1). Standard enthalpy of formation from elements ∆H_(f,298)^0 and standard enthalpy ∆S_298^0 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.
Keywords: E.M.F. method; Gibbs free energy; Formation of Cu2In2O5
Correspondence Address:
D. Jendrzejczyk-Handzlik,
AGH University of Science and Technology, Faculty of Non-Ferrous Metals, Kraków, Poland;
email: djendrze@agh.edu.pl
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