Figure 7.

Comparison of the distributions of local order parameters for several solid forms. The variables q₆, q₄, and w₄ are the local bond order parameters; ${\overline{q}}_6$, ${\overline{q}}_4$, and ${\overline{w}}_4$ are the averaged bond order parameters. In order to minimize thermal smearing, order parameters for each atom are obtained by averaging over 200 equilibrated configurations. 4000 dots corresponding to 4000 atoms are given for each solid form. The fcc structure with stacking faults (SF fcc in legend) show two types of atoms according to their local order parameters (see green clusters in (a) and (b)). The averaged bond order parameters include the second neighbor shell. Therefore, the atoms of the fcc structure with stacking faults split into more types as the local environment of an atom becomes more diversified (see green clusters in (c) and (d)).