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We report on crystal structure data and hydrogenation properties of 24 palladium-rich intermetallic compounds with elements from groups 12–16 of the Periodic Table. Refined crystal structures based on X-ray powder diffraction data are presented for Pd 3 As (Fe 3 P type structure) and several members of the Pd 5 TlAs type structure family. Hydrogenation was studied  in situ  by differential scanning calorimetry (DSC) under 5.0 MPa hydrogen pressure up to 430 °C. Pd 0.75 Zn 0.25 , PdCd, PdHg, Pd 2 Sn, Pd5Pb3, Pd 13 Pb 9 , Pd 3 As, Pd 20 Sb 7 , Pd 8 Sb 3 , Pd 5 Sb 2 , PdSb, Pd 5 Bi 2 , Pd 17 Se 15 , Pd 4 Se, Pd 5 TlAs, Pd 5 CdSe, Pd 5 CdAs, Pd 5 HgSe, Pd 5 InAs, Pd 8 In 2 Se and Pd 3 Bi 2 Se 2  do not show any sign of hydrogen uptake according to DSC and X-ray diffraction. For Pd 3 Sn and Pd 3 Pb a significant hydrogen uptake with unit cell volume increases of 0.4 and 0.6 %, respectively, with a retained structure type of the parent intermetallic was observed. Hydrogenation of Pd 5 InSe yields Pd 3 InH ≈0.9  and a mixture of palladium selenides. Thermal analysis experiments in helium and in hydrogen atmosphere show that this is a multistep reaction with a decomposition of Pd 5 InSe to Pd 3 In and a liquid phase and subsequent hydrogenation of Pd 3 In.

Crystal structures and hydrogenation properties of palladium-rich compounds with elements from groups 12–16