The “same activity” method was used to determine the activity interaction coefficient of Al to Fe in a Si-based solution. Al was dissolved into a binary Si-Fe solution at 1663, 1673, 1693 and 1723 K. The solubility of Fe and Al in silicon was determined at different temperatures, and the interaction coefficients of Al to Fe were calculated and obtained by fitting the solubility data of Al and Fe. Scanning Electron Microscopy-Energy Dispersive Spectrometer (SEM-EDS) and Electron Probe Micro Analyzer (EPMA) techniques were used to verify the uniformity of the Si-Fe-Al alloy samples and the reliability of the interaction coefficient obtained by experiments at 1693 and 1723 K. The X-ray Powder Diffraction (XRD) results displayed the phase transformation from FeAl₃Si₂ to FeAl_2.7Si_2.3 to Fe₃Al_0.3Si_0.7 with rising dissolution temperature, and crystallographic data of the phases were obtained by Rietveld refinements.

使用“相同活性”方法确定在硅基溶液中Al与Fe的活性相互作用系数。在1663、1673、1693和1723 K下将Al溶解在二元Si-Fe溶液中。在不同温度下确定Fe和Al在硅中的溶解度，并通过拟合溶解度来计算和获得Al与Fe的相互作用系数铝和铁的数据。扫描电子显微镜-能量分散光谱仪（SEM-EDS）和电子探针显微分析仪（EPMA）技术用于验证Si-Fe-Al合金样品的均匀性以及通过1693和1723实验获得的相互作用系数的可靠性K. X射线粉末衍射（XRD）结果显示了从FeAl ₃ Si ₂到FeAl的相变随着溶解温度的升高，从_2.7 Si _2.3转变为Fe ₃ Al _0.3 Si _0.7，并通过Rietveld精炼获得了相的晶体学数据。