In situ transmission electron microscopy observation of the decomposition of MgH 2 nanofiber

In this paper, we presented an investigation of the phase transformation of MgH2 to Mg, in which a sample of a single-crystal MgH2 nanofiber was prepared by hydriding chemical vapor deposition (HCVD) and observed by in situ (high-resolution) transmission electron microscopy (TEM). The results indicated that the orientation relationship between MgH2 and Mg during the phase change was: one of the zone axis of MgH2 <110> parallel to Mg [0001] zone axis, or one of the plane {110} of MgH2 parallel to the basal plane of Mg (0001). On the basis of the obtained results, we proposed a structural model for the phase change of MgH2 to Mg.

[1]  T. Akiyama,et al.  Shape-Controlled Growth of MgH2/Mg Nano/Microstructures Via Hydriding Chemical Vapor Deposition , 2010 .

[2]  C. Milanese,et al.  Sorption properties of NaBH4/MH2 (M = Mg, Ti) powder systems , 2010 .

[3]  Chhagan Lal,et al.  Hydrogen storage in Mg: A most promising material , 2010 .

[4]  D. Mitlin,et al.  Hydrogen storage in binary and ternary Mg-based alloys: A comprehensive experimental study , 2010 .

[5]  I. R. Harris,et al.  MgH2 → Mg phase transformation driven by a high-energy electron beam: An in situ transmission electron microscopy study , 2010 .

[6]  T. Akiyama,et al.  Direct synthesis of MgH2 nanofibers at different hydrogen pressures , 2009 .

[7]  Lei Xie,et al.  Hydrogen absorption–desorption, optical transmission properties and annealing effect of Mg thin films prepared by magnetron sputtering , 2009 .

[8]  T. Akiyama,et al.  Hydrogen storage property of MgH2 synthesized by hydriding chemical vapor deposition , 2007 .

[9]  M. Hirscher,et al.  Metal hydride materials for solid hydrogen storage: a review , 2007 .

[10]  Jun Chen,et al.  Magnesium nanowires: enhanced kinetics for hydrogen absorption and desorption. , 2007, Journal of the American Chemical Society.

[11]  T. Czujko,et al.  Particle size, grain size and γ-MgH2 effects on the desorption properties of nanocrystalline commercial magnesium hydride processed by controlled mechanical milling , 2006 .

[12]  T. Akiyama,et al.  Hydriding Chemical Vapor Deposition of Metal Hydride Nano-Fibers , 2006 .

[13]  V. Boldyrev,et al.  A study of the electron-beam-induced decomposition of magnesium hydride single crystals , 1987 .

[14]  T. Schober.  The magnesium-hydrogen system: Transmission electron microscopy , 1981 .

[15]  H. Friedrich,et al.  Magnesium Technology - Metallurgy, Design Data, Applications , 2006 .