Magnesium Hydride of Orthorhombic Crystal from High-Energy Ball Milling under Hydrogen Atmosphere

Abstract:

The crystal structure of magnesium hydride affects the properties of magnesium for hydrogen storage. The crystal phase and dehydriding temperature of magnesium hydride from magnesium by high-energy ball milling under hydrogen atmosphere with anthracite carbon, which was prepared from anthracite coal by demineralization and carbonization, as milling aid was investigated. The HRTEM observation and XRD characterization showed that the Mg hydrided into nanocrystalline β-MgH₂ of tetrahedral crystal structure and γ-MgH₂ of orthorhombic crystal structure during milling under 1 MPa of hydrogen, and the γ-MgH₂ increased with the extension of milling time. The DSC analysis showed that the endothermic peak of γ-MgH₂ was 53 °C lower than that of β-MgH₂ in the material from 10 h of milling.

• Periodical: Advanced Materials Research (Volumes 724-725)
• Pages: 1033-1036
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.724-725.1033
• Online since: August 2013
• Authors: Shi Xue Zhou, Wei Xian Ran, Min Jian Yang, De Xi Wang, Guo Qiang Chen, Ye Zhang, Zong Ying Han, Qian Qian Zhang
• Keywords: Crystal Structure, High-Energy Ball Milling, Hydrogen Storage, Magnesium Hydride, Nanocrystalline Materials

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