Modification of the Activities of Components in Ca<sub>2</sub>SiO<sub>4</sub>–Ca<sub>3</sub>P<sub>2</sub>O<sub>8</sub> Solid Solution at 1573 K

The activities of components in Ca2SiO4–Ca3P2O8 solid solutions have been reported by preceding studies as the basic thermodynamic data for phosphorus removal in the steelmaking process. Since the reported activities contained the uncertainties accumulated from thermodynamic data, this study aimed to reevaluate the experimental results in the preceding studies. Firstly, the equilibrium constant of the following reaction used to calculate the P2O5 activities was measured at 1573 K through a gas equilibrium method.