New quaternary hydride CeZnSnH<sub>1.5</sub> : structure, Magnetism, and chemical bonding
Langue
en
Article de revue
Ce document a été publié dans
Chemistry of Materials. 2011, vol. 23, n° 5, p. 1096-1104
American Chemical Society
Résumé en anglais
The quaternary hydride CeZnSnH<sub>1.5</sub> was synthesized from a CeZnSn precursor upon hydrogenation at 553 K and 4 MPa H<sub>2</sub> pressure. Single-crystal X-ray diffraction data reveal that the metal atoms adopt an ...Lire la suite >
The quaternary hydride CeZnSnH<sub>1.5</sub> was synthesized from a CeZnSn precursor upon hydrogenation at 553 K and 4 MPa H<sub>2</sub> pressure. Single-crystal X-ray diffraction data reveal that the metal atoms adopt an YPtAs-type structure: <i>P</i>6<sub>3</sub>/<i>mmc</i>, <i>a</i> = 449.34(9) and <i>c</i> = 1731.3(4) pm, w<i>R</i>2 = 0.0493, 218 <i>F</i><sup>2</sup> values, and 12 variables. The hydrogen atoms fill three crystallographically independent ZnCe<sub>3</sub> tetrahedral sites, leading to the composition CeZnSnH<sub>1.5</sub>. Hydrogenation anisotropically modifies the unit cell parameters, i.e., 456.7 → 449.34 pm (−1.6%) for <i>a</i> and 1673.8 → 1731.3 pm (+3.4%) for <i>c</i>. 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 CeZnSnH<sub>1.5</sub>.< Réduire
Mots clés en anglais
Hydride
Crystal chemistry
CeZnSnH1.5
Magnetic properties
Electronic structure
Origine
Importé de halUnités de recherche