Electrochemical measurement of oxygen in liquid nickel

Abstract

E.m.f. measurements on the galvanic cell: Mo|Mo + MoO 2|ZrO 2(CaO)|O(in Ni)LaCrO 3|Pt were performed at 1773, 1823, and 1873 K to determine the thermodynamic properties of oxygen dissolved in liquid nickel. The Gibbs energy change for the solution of oxygen in liquid nickel was determined as ΔG° (O)/kJ mol −1 = −RT In[a (O)/p {O 2(Ni)} 1 2 ] = −{81.8 + 0.0084( T K )} ± 1.2 where p{O 2(Ni)} is the oxygen partial pressure in equilibrium with oxygen dissolved in liquid nickel, and the Henrian activity a(O) of oxygen is referred to the dissolved oxygen in hypothetical (Ni + 1 mass per cent O) solution.