文摘
In-situ synchrotron X-ray diffraction (SR-XRD) combined with transmission electron microscope (TEM) and first-principle calculations was employed to reveal the mechanism of hydrogen-induced decomposition of 18R-type long period stacking ordered (LPSO) structure. 80xA0;wt.% of the structure was decomposed by 0.05xA0;MPa H2 at 280xA0;°C in 90xA0;min, producing 6xA0;wt.% Mg, 50xA0;wt.% MgH2, 15xA0;wt.% YH2, 9xA0;wt.% Mg2Ni, and 3xA0;wt.% Mg2NiH4. The formation of YH2 nanoparticles is the fastest process due to the strong interaction between hydrogen atoms and dispersive L12-Ni6Y8 clusters. Furthermore, the metastable Mg6Ni nanocrystals, which transformed to Mg2Ni and Mg nanoparticles, was detected.