Abstract
The equilibrium Ca3P2(s) = 3[Ca] + 2[P] was studied at 1600 ° by equilibrating liquid iron, saturated with Ca3P2, and contained in a TiN crucible, with Ca vapor. The source of Ca was liquid Ca contained in an Mo crucible, and the vapor pressure of Ca was varied by varying the position of the Mo crucible in the temperature gradient of a vertical tube furnace. A least-squares analysis of the data gave\(K_{Ca_3 P_2 } = 7.0 \times 10^{--14} \) and\(e_P^{Ca} = - 3.1\). The simultaneous equilibria CaO(s) = [Ca] + [O] and CaS(s) = [Ca] + [S] were studied at 1600 ° by equilibrating liquid iron, contained in a pressed and sintered CaO-CaS crucible with Ca vapor. The advantage of this technique is that two equilibrium constants,K cas andK cao, and two interaction coefficients,\(e_S^{Ca} \) and\(e_O^{Ca} \) can be determined from one set of experiments. It was determined that, at 1600 °,K cas = 5.9 × 10−8 K cao = 5.5 × 10−9,\(e_S^{Ca} = - 106\), and\(e_O^{Ca} = - 475\).
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Han, Q., Zhang, X., Chen, D. et al. The calcium-phosphorus and the simultaneous calcium-oxygen and calcium-sulfur equilibria in liquid iron. Metall Trans B 19, 617–622 (1988). https://doi.org/10.1007/BF02659153
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DOI: https://doi.org/10.1007/BF02659153