Synthesis reveals distinct crystal structures of SrPdPb and SrPtPb, highlighting their unique properties.
The equiatomic plumbides SrPdPb and SrPtPb were synthesized by induction-melting of the elements in sealed tantalum ampoules followed by annealing in muffle furnaces. Both crystal structures were refined from single crystal X-ray diffractometer data: TiNiSi type, Pnma , a = 764.58(4), b = 478.23(7), c = 832.20(7) pm, wR 2 = 0.0432, 643 F 2 values, 20 variables for SrPdPb and a = 765.05(2), b = 476.31(3), c = 825.25(4), wR 2 = 0.0691, 642 F 2 values, 20 variables for SrPtPb. The palladium (platinum) and lead atoms built orthorhombically distorted and strongly puckered Pd 3 Pb 3 (283–290 pm Pd–Pb) respectively Pt 3 Pb 3 (281–291 pm Pt–Pb) hexagons that coordinate the strontium atoms.
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Heletta et al. (2025) studied this question.
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