Structure D 2000Structure and Properties of Dimorphic CePdZn. -High-temperature β-CePdZn is prepared from the elements at 1370 K (5 min, quenching). The low-temperature phase α-CePdZn is obtained from the β-phase by annealing at 1080 K for two weeks. Both modifications are characterized by powder and single crystal XRD. β-CePdZn crystallizes in the orthorhombic space group Pnma with Z = 4 (TiNiSi-type structure), and α-CePdZn in the space group P62m with Z = 3 (ZrNiAl-type structure). The Pd and Zn atoms form three-dimensional [PdZn] networks in both modifications leaving channels for the Ce atoms. β-CePdZn orders antiferromagnetically at 3.2 K, while no magnetic ordering is observed for α-CePdZn down to 2 K. Both modifications are further characterized by DFT quantum chemical calculations. -(HERMES, W.; MISHRA, R.; MUELLER, H.; JOHRENDT, D.; POETTGEN*, R.