It was first reported to have a CuAu type structure by Schubert et. al. . Later, two other structural modifications (TiAl3-type and ZrAl3-type) were reported by Bhan and Schubert . Kohlmann and Ritter had performed systematic experimental investigations using neutron powder diffraction and confirmed the atomic distributions of In and Pd (belonging to close X-ray scattering factors) in the three different structure types of InPd3 . According to their report, the reaction conditions play an important role in determining the structure type. Long annealing time at high temperature (T > 800 K) leads to the ZrAl3-structure type (I4/mmm (no. 139); a = 406.196(5) pm, c = 1520.31(2) pm, Z =4). Shorter reaction time at relatively low temperature (T < 750 K) leads to the TiAl3 structure type (I4/mmm (no. 139), a = 409.96(2) pm, c = 747.59 pm, Z = 2). When the samples were quenched in air after short reaction times, a disordered AuCu structure was found for InPd3 [chemical formula: (In0.5Pd0.5)Pd] (Fig. ) . An interesting order-disorder phase transformation was established in sputter deposited InPd3, by Huang and Chang; a disordered face-centered cubic phase adopts an ordered tetragonal structure after annealing up to 550°C . Selective chemical substitution of Cu in TiAl3-type InPd3 was explored by combinations of X-ray diffraction and DFT calculations, where Cu substitutes one of the two crystallographically different Pd-positions due to electronic reasons .