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Desorption properties of nanostructured MgH2 synthesized by high-energy mechanical milling

Simchi, H ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. Publisher: European Powder Metallurgy Association (EPMA) , 2008
  3. Abstract:
  4. The hydrogen desorption properties of nanocrystalline magnesium hydride processed by high-energy mechanical milling was investigated. MgH2 powder was milled for various times (up to 16 h) under a high purity argon atmosphere and the effect of milling on the particle size and morphology, grain refinement, lattice strain, and desorption temperature was studied. It was shown that accumulated lattice strain combined with nanometric grain structure significantly decrease the desorption temperature. The effect of powder particle size was found to be of less importance. The lowest desorption temperature was obtained after 4 h high-energy milling. Nanostructured magnesium hydride with grain size of 20 nm with lattice strain of 0.94% yields a reduced desorption temperature of 360 °C
  5. Keywords:
  6. Desorption ; Grain refinement ; Grain size and shape ; Hydrides ; Hydrogen storage ; Mechanical alloying ; Milling (machining) ; Nanostructures ; Particle size ; Powder metallurgy ; Desorption temperatures ; High-energy mechanical milling ; Hydrogen storage materials ; Magnesium hydride ; Mechanical milling ; Nanocrystalline magnesium hydride ; Nanostructured magnesium ; Particle size and morphologies ; Atmospheric temperature
  7. Source: European International Powder Metallurgy Congress and Exhibition, Euro PM 2008, Mannheim, 29 September 2008 through 1 October 2008 ; Volume 2 , 2008 , Pages 351-356 ; 9781899072033 (ISBN)