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Structural characteristics and desorption properties of nanostructured MgH2 synthesised by high energy mechanical milling

Simchi, H ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.1179/003258909X12502872942372
  3. Publisher: 2011
  4. Abstract:
  5. The effect of particle size, lattice strain and crystallite size on the hydrogen desorption properties of nanocrystalline magnesium hydride powder was investigated. Commercial MgH2 powder was milled in a Spex 8000M up to 16 h and its structural evolution and desorption characteristics at different time intervals were examined using various analytical techniques. At the early stage of milling, the formation of metastable γ-MgH2 phase was noticed. While the crystallite size gradually decreased to 12 nm with increasing the milling time, the accumulated lattice strain gained a maximum value of 0·9% after 4 h milling. The highest drop in the desorption temperature (∼100°C) was attained at the peak strain with the average grain size of 20 nm. The particle size of MgH2 varied in the range of 20-50 μm without profound effect of the desorption properties
  6. Keywords:
  7. Analytical techniques ; Average grain size ; Desorption characteristics ; Desorption properties ; Desorption temperatures ; Grain size ; High-energy mechanical milling ; Hydrogen desorption ; Hydrogen storage materials ; Lattice strain ; Maximum values ; Mechanical milling ; Milling time ; Nano-structured ; Nanocrystalline magnesium hydride ; Structural characteristics ; Structural evolution ; Time interval ; Crystallite size ; Desorption ; Grain size and shape ; Hydrogen ; Hydrogen storage ; Magnesium ; Magnesium powder ; Mechanical alloying ; Milling (machining)
  8. Source: Powder Metallurgy ; Volume 54, Issue 4 , 2011 , Pages 480-483 ; 00325899 (ISSN)
  9. URL: http://www.tandfonline.com/doi/full/10.1179/003258909X12502872942372