Figure 1. Crystal structures of CsCl and Ni2Al3. Atoms on - and -sublattices are shown by small shaded circles and large open circles. For CsCl, distorted tetrahedral interstitial sites are also shown. For Ni2Al3, an empty sublattice is shown by squares. The actual Ni2Al3 structure is distorted slightly from the cubic arrangement shown. Numbers identify two inequivalent -sites in the Ni2Al3 structure present in a ratio of 2:1.

Figure 1. Crystal structures of CsCl and Ni2Al3. Atoms on - and -sublattices are shown by small shaded circles and large open circles. For CsCl, distorted tetrahedral interstitial sites are also shown. For Ni2Al3, an empty sublattice is shown by squares. The actual Ni2Al3 structure is distorted slightly from the cubic arrangement shown. Numbers identify two inequivalent -sites in the Ni2Al3 structure present in a ratio of 2:1.