High pressure experiments on the Mg₂Ni and Mg₂NiH₄–H systems

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• 作者：Chen ; J. ; Sakai ; T. ; Kitamura ; N. ; Tanaka ; H. ; Kiyobayashi ; T. ; Takeshita ; H.T. ; Kuriyama ; N.
• 关键词：High pressure ; Mg₂Ni and Mg₂NiH₄&ndash ; H system ; X-ray diffraction ; Thermal analysis
• 刊名：Journal of Alloys and Compounds
• 出版年：2002
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：January 17, 2002
• 卷：330-332
• 期：Complete
• 页码：162-165
• 文件大小：223 K

摘要

Electrical resistance of the Mg₂Ni and Mg₂NiH₄ powders was measured under compressing up to 6 gigapascals (GPa), using the four-point probe method at 20°C. Effects induced by the high-pressure treatment and heating at 400°C with or without hydrogen source LiAlH₄ were also studied. The structure and hydrogenation properties of the samples recovered after quenching from high pressure and high temperature were investigated employing the techniques of X-ray diffraction and thermal analyses such as differential scanning calorimetry, thermogravimetry and differential thermal analysis. Decreased absorption/desorption temperatures were observed for the treated samples owing to the changes of microstructure and kinetic factor.