Abstract
Interaction energy between component anion and cation of an oxide is evaluated from the lattice energy of the oxide. In the calculation of the lattice energy from thermal data and ionization energy of elements, the Born-Haber cycle is used. By assuming that no complex ions are formed in the slag and additivity of pairwise interaction, the interaction energy to oxide anion in a slag is expressed as the average of the lattice energy of the component oxides on the mole fraction base. The averaged lattice energy for sulfide anion in the slag is also derived by the same manner. The oxide anion in calcium oxide is chosen as the reference state in order to correlate the interaction energy with the activity coefficient of the oxide anion. The logarithmic value of the activity coefficient of oxide anion in a slag is expected to have linear relation with the averaged lattice energy obtained from the lattice energy of the component oxides. The relation is examined by the use of sulfide capacity data for several slags, where the activity coefficient of sulfide anion is also taken into account.
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