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Evaluations of Microstructure and Hydrogenation Properties on $Mg_2NiH_x$  

Seok, Song (Department of Materials Science and Engineering/Research Center for Sustainable ECo-Devices and Materials (ReSEM), Chungju National University)
Shin, Kyung (Department of Materials Science and Engineering/Research Center for Sustainable ECo-Devices and Materials (ReSEM), Chungju National University)
Kweon, Soon-Yong (Department of Materials Science and Engineering/Research Center for Sustainable ECo-Devices and Materials (ReSEM), Chungju National University)
Ur, Soon-Chul (Department of Materials Science and Engineering/Research Center for Sustainable ECo-Devices and Materials (ReSEM), Chungju National University)
Lee, Young-Geun (Department of Materials Science and Engineering/Research Center for Sustainable ECo-Devices and Materials (ReSEM), Chungju National University)
Hong, Tae-Whan (Department of Materials Science and Engineering/Research Center for Sustainable ECo-Devices and Materials (ReSEM), Chungju National University)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.16, no.3, 2005 , pp. 238-243 More about this Journal
Abstract
Mg and Mg-based alloys are most important hydrogen storage materials. It is a lightweight and low-cost materials with high hydrogen storage capacity. However, the formation of hydride at high temperature, the deterioration effect, the hydriding and dehydriding kinetics are bad factor for application. In this study, Mg and Ni have been produced by hydrogen induced mechanical alloying(HIMA) process. The raw materials, Mg(purity 99.9%) chip and Ni(purity 99.95%) chip was prepared by using a planetary ball mill apparatus(FRITSCH pulverisette 5). The balls to chips mass ratio(BCR) are 30:1. The hydrogen pressure induced 2.0MPa and milling times were 12, 24, 48, 72, 96 hours with a rotating speed of 200rpm. X-ray diffraction(XRD) analysis was made to characterize the crystallite size and misfit strain. The crystallite size measured by laser particle size analysis(PSA). Microstructure changes were investigated by scanning electron microscopy(SEM) and the transmission electron microscopy(TEM). The hydrogen storage properties were evaluated by using an Sivert's type automatic pressure-composition-therm(PCT) apparatus.
Keywords
Hydrogen storage materials; Hydrogen Induced Mechanically Alloying; Crystallite size; Misfit strain;
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