Journal of the Japan Institute of Metals and Materials · 1972 · 27 citations · 0 references
Natural SciencesMaterials EngineeringMaterials ScienceElectrochemistryMaterials ThermodynamicsThermodynamicsAlloy ThermodynamicsAlloysGalvanic CellsMetal MaterialsMetalsPhysical MetallurgyCopper AlloysFree Energy ChangesLiquid Alloy ThermodynamicsThermodynamic AnalysisThermodynamic Data Of ElectrolytesThermodynamic EntropyThermodynamic EquilibriumThermodynamics Of Galvanic Cells
Electromotive force measurement of galvanic cells involving oxide electrolytes have been made in order to obtain the standard free energy of formation of SnO2 in the temperature range 900°∼1100°C and the thermodynamic properties of copper and tin in liquid Cu-Sn alloys at 1100°C.The standard free energy of formation of SnO2 was determined: ΔF(SnO2)°=−134.7+46.9×10−3T (kcal/mol) between 900° and 1100°C. The activity of tin in liquid Cu-Sn alloys showed a negative deviation from Raoult’s law at copper rich alloys and a slight positive deviation in the tin-rich alloys, and that of copper showed a negative deviation in the whole concentration range. Furthermore, other thermodynamic properties were also calculated.