[摘要]：The quaternary hydride CeZnSnH1.5 was synthesized from a CeZnSn precursor upon hydrogenation at 553 K and 4 MPa H-2 pressure. Single-crystal X-ray diffraction data reveal that the metal atoms adopt an YPtAs-type structure: P6(3)/mmc, a = 449.34(9) and c = 1731.3(4) pm, wR2 = 0.0493, 218 F-2 values, and 12 variables. The hydrogen atoms fill three crystallographically independent ZnCe3 tetrahedral sites, leading to the composition CeZnSnH1.5. Hydrogenation anisotropically modifies the unit cell parameters, i.e., 456.7 -> 449.34 pm (-1.6%) for a and 1673.8 -> 1731.3 pm (+3.4%) for c. This leads to a drastic flattening of the two-dimensional [ZnSn] layers and a decrease of the Zn-Sn distances from 271 to 260 pm. Hydrogenation increases the Curie temperature from 4.8 K for; CeZnSn to 7.3 K for CeZnSnH1.5.
