| The solubility of silver in the BaO-B₂O₃ slag at 1698K was measured as a measure of basicity, and compared to that of CaO-B₂O₃ slag. The solubility of silver in molten slags has a minimum value at the composition of 45(㏖%)BaO-B₂O₃ and 65(㏖%)CaO-B₂O₃, respectively. In the acidic region, BaO is more basic than CaO by, at most, about 33%, based on the difference of Ag solubility at the same activity of basic oxide, indicating that BaO is not a much-stronger basic oxide than CaO in the acidic slags. However, in the basic region, BaO is about 5 times more basic than CaO. From the relationship between the composition of slags and the integral molar enthalpy of mixing of the liquid mixtures for both slags, the relationship between the basicity of slags and the modification of borate structure was discussed. The correlation of Ag solubility with nitride capacity, carbide capacity, and theoretical optical basicity were also discussed. |
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