The crystal structure of novel hydrides in the Mg-Ni-H system has been studied using a powder X-ray diffraction and transmission electron microscopy. A cubic-anvil-type apparatus was utilized to prepare samples. The new hydride with a chemical composition of around MgH 2-60 at% Ni was synthesized at 1073 K for 2 h under a pressure as high as 5 GPa. From TGA analysis, the new hydride was found to be Mg 2Ni 3H 3.4. Orthorhombic and monoclinic crystal systems with a primitive cell were proposed as possible symmetries of the new hydride. X-ray and electron diffraction patterns of the new hydride were indexed in an orthorhombic structure with a□ 0.8859(4), b□ 1.3740(5), c□ 0.4694(2) nm. Moreover, decomposition of the hydride into Mg 2Ni was observed by the transmission electron microscopy.
|Number of pages||5|
|Journal||Journal of Alloys and Compounds|
|Publication status||Published - 2002 Jan 17|
|Event||Proceedings of the International Symposium on Metal-Hydrogen (MH 2000) - Noosa Heads, QLD, Australia|
Duration: 2000 Oct 1 → 2000 Oct 6
- Crystal structure
- Magnesium-nickel-hydrogen system