Figure 5.

The test results for three iron oxides U, the horizontal direction is the parameters of the same oxide ((a–c) for Fe₂O₃, (d–f) for Fe₃O₄, (g–i) for FeO, (j–l) for FeO*), and the vertical direction is the comparison of the same results. The histogram is the calculation time, the orange dotted line is the position of the final value, and the red line is the experimental value.