THERMODYNAMICS AND PHASE EQUILIBRIUM OF Cu-Ce-O, Cu-Ce-S, Cu-Ce-O-S LIQUID SOLUTIONS

Acta Metall Sin

1993, Vol. 29

Issue (7): 78-84 DOI:

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THERMODYNAMICS AND PHASE EQUILIBRIUM OF Cu-Ce-O, Cu-Ce-S, Cu-Ce-O-S LIQUID SOLUTIONS

DU Ting;LI Guodong Central Iron and Steel Research Institute; Ministry of Metallurgical Industry; BeijingCentral Iron and Steel Research Institute; Ministry of Metallurgical Industry; Beijing 100081

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DU Ting;LI Guodong Central Iron and Steel Research Institute; Ministry of Metallurgical Industry; BeijingCentral Iron and Steel Research Institute; Ministry of Metallurgical Industry; Beijing 100081. THERMODYNAMICS AND PHASE EQUILIBRIUM OF Cu-Ce-O, Cu-Ce-S, Cu-Ce-O-S LIQUID SOLUTIONS. Acta Metall Sin, 1993, 29(7): 78-84.

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Abstract Thermodynamics of Cu-Ce-O, Cu-Ce-S and Cu-Ce-O-S solutions at1200℃ were studied by using solid electrolyte cell and chemical equilibrium method.The equilibrium constants of deoxidation, desulfurization and deoxysulfurization by Ce,the Gibbs standard free energies of the formation of Ce_2O_3, CeS, Ce_2O_2S in Cu-basesolution, activity interaction coefficients of S and Ce, temperature dependence of stand-ard free energy of solution of Ce in Cu and the self-interaction coefficients of Ce in liq-uid Cu have been obtained. The phase precipitation diagram for Cu-Ce-S-O systemhas been plotted. The steady thermodynamic condition of the existence of Ce_2O_3, CeSand Ce_2O_2S in liquid Cu has been determined.

Key words: Ce O S Cu liquid thermodynamical property phase diagram

Received: 18 July 1993

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