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Phase-pure samples of the antimonides PrPdSb and NdPdSb were prepared by arc-melting pieces of the elements and subsequent annealing. The samples were investigated by powder and single crystal X-ray diffraction: NdPtSb type, space group  P 6 3  mc ,  a  = 458.70(5),  c  = 780.55(6) pm,  wR 2 = 0.0272, 244  F  2  values, 11 variable parameters for PrPdSb and  a  = 458.18(4),  c  = 771.25(6) pm,  wR 2 = 0.0317, 229  F  2  values, 11 variable parameters for NdPdSb. The palladium and antimony atoms form slightly puckered Pd 3 Sb 3  hexagons which are rotated by 60° in every other layer. The rare earth ( RE ) atoms are coordinated by two Pd 3 Sb 3  hexagons with the  RE –Pd shorter than the  RE –Sb contacts. The  121 Sb Mössbauer spectra at  T  = 5 K confirm the antimonide character with isomer shifts of −7.55 (PrPdSb) and −7.47 mm · s −1  (NdPdSb). In agreement with the crystal structures, each spectrum could be fitted with one quadrupole split signal.

A structural and 121 Sb Mössbauer-spectroscopic study of PrPdSb and NdPdSb