Abstract
In this work, a two-step method for the preparation of nanocrystalline MgH 2 is presented, where the first step consists of synthesis of nanocrystalline Mg powder by the gas-phase condensation method (GPC) and the second of in situ hydridation leading to the formation of MgH 2 nanoparticles. By transmission electron microscopy (TEM) and electron diffraction (ED), crystalline Mg nanoparticles from GPC were found to have mean size within the range of 30–50 nm, while in the case of MgH 2 nanoparticles these values increase approximately 2–3 times mainly due to particles growth during the hydridation step. The X-ray diffraction (XRD) analysis shows the high conversion into the MgH 2 phase after hydridation. By X-ray photoelectron spectroscopy (XPS) metallic magnesium was detected below a magnesium oxide layer of 3–4 nm for the Mg sample prepared by GPC, which shows the efficiency of a novel sample transfer system without air exposure between N 2-glove-box, preparation chamber and experimental apparatus.
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