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The ternary stannides PrZnSn and NdZnSn were synthesized by induction-melting of the elements in sealed tantalum tubes. They were characterized by powder and single-crystal X-ray diffraction: YPtAs-type structure, P6 3 =mmc, a = 455:4(1) and c = 1650:3(2) pm, wR2=0.0266, 297 F 2  for PrZnSn and a = 453:7(1) and c = 1637:0(4) pm, wR2=0.1558, 234 F 2  for NdZnSn with 12 variables per refinement. PrZnSn and NdZnSn are AlB 2  superstructures with slightly puckered and ordered [Zn 3 Sn 3 ] hexagons in AA´BB´ stacking sequence along the crystallographic c axis. Hydrogenation results in the new hexagonal hydrides PrZnSnH 1:5  (a = 447:98(8) and c = 1707:5(5) pm) and NdZnSnH 1:5  (a = 448:28(8) and c = 1689:8(2) pm). Filling of RE 3 Zn tetrahedra by hydrogen leads to anisotropic changes of the lattice parameters and a drastic flattening of the [Zn 3 Sn 3 ] layers. Temperature-dependent magnetic susceptibility measurements show Curie-Weiss behavior for PrZnSn and NdZnSn with experimental magnetic moments close to the free-ion values of RE 3+ . Magnetic ordering is detected at 4.7 (PrZnSn) and 6:5 K (NdZnSn). Hydrogenation induces ferromagnetism with increased ordering temperatures of 12.0 (PrZnSnH 1:5 ) and 14:5 K (NdZnSnH 1:5 ).

From REZnSn to REZnSnH 1:5 (RE = Pr, Nd) – Inducing Ferromagnetism through Hydrogenation