Crystal structure and
hydrogenation properties of the hexagonal Dy2M17 and Dy2M17Cx (M = Fe, Co, Ni; x <
0.5) compounds
Chem.
Met. Alloys 7
(2014) 26-31
https://doi.org/10.30970/cma7.0264
Volodymyr LEVYTSKYY, Volodymyr
BABIZHETSKYY, Oksana MYAKUSH, Bogdan KOTUR, Ihor KOVAL’CHUK
The
crystal structures of the Dy2M17
(M = Fe, Co, Ni) compounds were
investigated from single crystal X-ray diffraction data (Th2Ni17
type structure, space group P63/mmc). The Dy2M17
binaries (M = Co, Ni) dissolve
limited amounts of carbon, up to 0.2 (M =
Co) and 0.4 (M = Ni) at. C/f.u. The hydrogenation
properties of the parent compounds and their carbides were investigated. Dy2M17 (M = Co, Ni) absorb 3.4 (M =
Co) and 3.5 (M = Ni) at. H/f.u. at 5 MPa hydrogen
pressure. The carbides Dy2M17Cx (M = Co, Ni) absorb 2.7 (M = Co) and 2.8 (M = Ni) at. H/f.u.
The synthesized carbides, hydrides and carbohydrides
preserve the crystal structure of the parent compounds.
Unit cell of ideal Dy2M17 (M = Co, Ni) with Th2Ni17-type structure.
Keywords
Hydrides / Carbides / Crystal structure / X-ray
diffraction