Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7722287 | International Journal of Hydrogen Energy | 2013 | 6 Pages |
Abstract
The structure of an unknown crystalline phase observed during the hydrogen absorption reaction of the powder mixtures 2NaH + MgB2 at high pressure has been studied by ab-initio structure determination from powder diffraction. The sequence of un-overlapped peaks extracted from the X-ray powder diffraction pattern could be indexed with a primitive cubic cell with lattice parameter a = 7.319 Ã
. The diffraction patterns of the peaks are matched with the Pa-3 space group. The stoichiometry of the hydrogen absorption reaction suggests the presence of a high-boron content phase in the compound under investigation. Assuming this phase to be composed only by boron atoms and therefore having a density similar to that found for boron polymorphs, the solution with a space group of Pa-3 leads to reasonable B-B interatomic distances.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Claudio Pistidda, Emilio Napolitano, Daphiny Pottmaier, Martin Dornheim, Thomas Klassen, Marcello Baricco, Stefano Enzo,