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Mg2NiH4 synthesis and decomposition reactions |
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| Authors: | M Polanski TK Nielsen I Kunce M Norek T P?ociński LR Jaroszewicz C Gundlach TR Jensen J Bystrzycki |
| Affiliation: | 1. Faculty of Advanced Technologies and Chemistry, Military University of Technology, 2 Kaliskiego St., 00-908 Warsaw, Poland;2. Department of Chemistry and iNANO, Aarhus University, Langelandsgade 140, DK-8000 Aarhus, Denmark;3. Faculty of Materials Science and Engineering, Warsaw University of Technology, 141 Wo?oska Str., 02-507 Warsaw, Poland;4. MAX-lab, Lund University, S-22100 Lund, Sweden |
| Abstract: | A ternary Mg2NiH4 hydride was synthesized using method that relies on a relatively short mechanical milling time (one hour) of a 2:1 MgH2–Ni powder mixture followed by sintering at a sufficiently high hydrogen pressure (>85 bar) and temperature (>400 °C). The ternary hydride forms in less than 2.5 h (including the milling time) with a yield of ∼90% as a mixture of two polymorphic forms. The mechanisms of formation and decomposition of ternary Mg2NiH4 under different hydrogen pressures were studied in detail using an in situ synchrotron radiation powder X-ray diffraction (SR-PXD) and high pressure DSC. The obtained experimental results are supported by morphological and microstructural investigations performed using SEM and high resolution STEM. Additionally, effects occurring during the desorption reaction were studied using DSC coupled with mass spectrometry. |
| Keywords: | Magnesium nickel hydride Synthesis Decomposition In situ synchrotron radiation powder diffraction High pressure DSC Structure |
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