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Unit cell parameters were investigated for the palladium/platinum and the B 13 …B 16  element-containing representatives of the Ni 2 In, NiAs and CdI 2  types in the whole range of homogeneity. For phases belonging to the defect Ni 2 In type, macroscopic density was also measured to determinate the number of atoms in the unit cell. For the homologous phases Pd 2 Sn(h) and Pd 5 Pb 3 (h 2 ), it has been found that the tin-containing compound shows (at the same Pd/B metal stoichiometry) a higher number of atoms in the unit cell than the lead-containing phase. The  d  electron concentration of the late transition metals controls predominantly the values of the axial ratio  c / a : rhodium and iridium-containing representatives of the NiAs family (possessing the same B element) show a higher  c / a  ratio than corresponding palladium and platinum-containing phases. Comparing the quasihomologous stannides IrSn, PtSn and AuSn, the largest difference between the sum of atomic radii and the measured shortest atomic distance, Δ d  = ( r  A  +  r  B ) –  d  A–B , is observed for IrSn and the smallest one for AuSn. Regarding this, the iridium and platinum-containing stannides possess obviously a larger charge transfer as well as a stronger bond energy than the gold containing compound.

On the crystal parameters of some representatives of the NiAs family containing platinum group metals and gold