Phase relations and hydrogenation behavior of Sr(Al1−xMgx)2 |
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| Authors: | Q A Zhang E Akiba |
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| Affiliation: | National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan |
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| Abstract: | The phase relations and hydrogenation behavior of Sr(Al1?xMgx)2 alloys were studied. The pseudobinary C36-type Laves phase Sr(Al,Mg)2 was found as a structural intermediate between the Zintl phase and the C14 Laves phase. The single-phase regions for the Zintl phase, C36 phase and C14 phase, were determined to be x=0–0.10, 0.45–0.68 and 0.80–1, respectively. The Mg-substituted Zintl phase Sr(Al0.95Mg0.05)2 can be hydrogenated to Sr(Al,Mg)2H2 at about 473 K. However, the Sr(Al,Mg)2H2 directly decomposes into SrH2 and Sr(Al,Mg)4 starting at 513 K. When the temperature is 573 K, the C36 Laves phase Sr(Al0.5Mg0.5)2 can be hydrogenated into SrMgH4 and Al, while the C14 Laves phase Sr(Al0.1Mg0.9)2 is hydrogenated into SrMgH4, Mg17Al12 and Mg. |
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| Keywords: | Hydrogen absorbing materials Metal hydrides Gas–solid reactions Crystal structure X-Ray diffraction |
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