TY - JOUR
T1 - Phase relations and hydrogenation behavior of Sr1-xCaxAl2 (0≤x≤1)
AU - Zhang, Q. A.
AU - Enoki, H.
AU - Akiba, E.
N1 - Funding Information:
This work is carried out as a part of the WE-NET project. Q.A. Zhang would like to thank the New Energy and Industrial Technology Department Organization (NEDO) of Japan for providing the NEDO fellowship.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2001/6/28
Y1 - 2001/6/28
N2 - The phase relations and hydrogenation behavior of Sr1-xCaxAl2 (x=0, 0.1, 0.2, 0.3, 0.5, 0.75 and 1.0) alloys have been studied. It was found that the Zintl phase with orthorhombic structure existed when x≤0.1, which transformed into an unknown hydride phase under hydrogen pressure of 7 MPa at 543 K for 5 days. Increasing x to 0.2, the Zintl phase and C15-type Laves phase coexisted. Both of them transformed into (Sr,Ca)H2 and Al upon hydrogenation. When x≥0.3, however, there was no Zintl phase but the Laves phase was dominant. After hydrogenation, there a certain amount of (Sr,Ca)H2 and Al as well as a large amount of C15 phase remained in hydrogenated Sr0.7Ca0.3Al2, Sr0.5Ca0.5Al2 and Sr0.25Ca0.75Al2. The crystal structure of the binary CaAl2 alloy did not change with hydrogenation.
AB - The phase relations and hydrogenation behavior of Sr1-xCaxAl2 (x=0, 0.1, 0.2, 0.3, 0.5, 0.75 and 1.0) alloys have been studied. It was found that the Zintl phase with orthorhombic structure existed when x≤0.1, which transformed into an unknown hydride phase under hydrogen pressure of 7 MPa at 543 K for 5 days. Increasing x to 0.2, the Zintl phase and C15-type Laves phase coexisted. Both of them transformed into (Sr,Ca)H2 and Al upon hydrogenation. When x≥0.3, however, there was no Zintl phase but the Laves phase was dominant. After hydrogenation, there a certain amount of (Sr,Ca)H2 and Al as well as a large amount of C15 phase remained in hydrogenated Sr0.7Ca0.3Al2, Sr0.5Ca0.5Al2 and Sr0.25Ca0.75Al2. The crystal structure of the binary CaAl2 alloy did not change with hydrogenation.
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U2 - 10.1016/S0925-8388(01)01195-1
DO - 10.1016/S0925-8388(01)01195-1
M3 - Article
AN - SCOPUS:0035963579
SN - 0925-8388
VL - 322
SP - 257
EP - 264
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
IS - 1-2
ER -