Bhan and Schubert had suggested different structure types for InPd3 i.e. the TiAl3-type, the ZrAl3-type, and the AuCu-type . Though apparently, they look different, all of them represent tetragonal ccp superstructures and are closely related to each other . But, the ambiguity remained due to the similarity in X-ray scattering factors of In and Pd until recently Kohlmann and Ritter had performed systematic investigations varying the temperature program, and the assignment of atoms was performed by refinement of neutron powder diffraction data unambiguously .