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Hydrogen desorption properties of FCC super-lattice hydride Mg7NbHx prepared by ultra-high pressure techniques

Hydrogen desorption properties of FCC super-lattice hydride Mg7NbHx prepared by ultra-high pressure techniques

Authors :
Tetsuo Sakai
Atsushi Ueda
Hideaki Tanaka
Shigeo Tanase
Naoyuki Kitamura
Daisuke Kyoi
Source :
Journal of Alloys and Compounds. 428:268-273
Publication Year :
2007
Publisher :
Elsevier BV, 2007.

Abstract

Preparation conditions of a FCC phase Mg 7 NbH x have been investigated in detailed by means of an ultra-high pressure technique. The FCC phase Mg 7 NbH x was obtained at 4 GPa or higher, but always coexisted with a monoclinic phase MgNb 2 H y . Although the monoclinic phase MgNb 2 H y releases only a small amount of hydrogen at around 623 K, the FCC phase Mg 7 NbH x exhibits large amount of hydrogen desorption (ca. 4.5 mass%) around 573 K of which temperature is by 140 K lower than that of MgH 2 . It was found that the hydrogen desorption temperature of the FCC hydrides tend to decrease in the following series: Mg 7 TiH x > Mg 7 NbH x > Mg 6 VH x with increasing the vacancy ratio of the 4b site.

Details

ISSN :
09258388
Volume :
428
Database :
OpenAIRE
Journal :
Journal of Alloys and Compounds
Accession number :
edsair.doi...........c44b75c0612d21b300139ca64b72565f
Full Text :
https://doi.org/10.1016/j.jallcom.2006.02.073