In order to determine the activities of phosphorus and iron in liquid {Cu-Fe-P} alloys, the two coexisting phases of liquid {Cu-Fe-P} alloys + solid solutions were brought into equilibrium with a mixture of AI 20 3 + AIP0 4 + Fe xAI20 4 at temperatures of 1416K and 1526K.The oxygen partial pressures were measured with the aid of a solid-oxide galvanic cell of the type:The equilibrium reactions underlying the experiments can be expressed by 2[P]cu + (5/2) (0 2) + = 2 and x[Fe]cu + (1/2) (02) + = The Henrian activity coefficient referred to 1 wt pet solution in pure liquid copper could be well expressed by the formulaThe iron activities referred to pure solid iron could be formulated as log aFe =-(0.37 ±0.12) + (500 ±200) /(T/K) .
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