Phase structure and hydrogen storage properties of REMg(8.35)Ni(2.18)Al(0.21) (RE=La, Ce, Pr, and Nd) hydrogen storage alloys

REMg(8.35)Ni(21.8)Al(0.21) (RE=La, Ce, Pr, and Nd) alloys were prepared by induction melting and following annealing. X-ray diffraction (XRD) and scanning electron microscopy (SEM) results showed that the alloys were composed of Mg(2)Ni, (La, Pr, Nd)Mg(2)Ni, (La, Ce)(2)Mg(17), (Ce, Pr, Nd)Mg(12) and...

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Bibliographic Details
Published in:Journal of rare earths 2013-08, Vol.31 (8), p.784-789
Main Authors: Liu, Yanqing, Han, Shumin, Hu, Lin, Liu, Baozhong, Zhao, Xin, Jia, Yanhong
Format: Article
Language:English
Subjects:
Alloys
Diffraction
Hydrogen storage
Intermetallic compounds
Neodymium base alloys
Phase transformations
Rare earth metals
Scanning electron microscopy
X-rays
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Summary:REMg(8.35)Ni(21.8)Al(0.21) (RE=La, Ce, Pr, and Nd) alloys were prepared by induction melting and following annealing. X-ray diffraction (XRD) and scanning electron microscopy (SEM) results showed that the alloys were composed of Mg(2)Ni, (La, Pr, Nd)Mg(2)Ni, (La, Ce)(2)Mg(17), (Ce, Pr, Nd)Mg(12) and Ce(2)Ni(7) phases. The above phases were disproportioned into Mg(2)NiH(4), MgH(2) and REH(x) (x=2.51 or 3) phases in hydriding. CeH(2.51) phase transformed into CeH(2.29) phase in dehydriding, whereas LaH(3), PrH(3) and NdH(3) phases remained unchanged. The PrMg(8.41)Ni(2.14)Al(0.20) alloy had the fastest hydriding kinetics and the highest dehydriding plateau pressure while the CeMg(8.35)Ni(2.18)Al(0.21) alloy presented the best hydriding/dehydriding reversibility. The onset hydrogen desorption temperature of the CeMg(8.35)Ni(2.18)Al(0.21) hydride decreased remarkably owing to the phase transformation between the CeH(2.51) and the CeH(2.29).
ISSN:1002-0721
DOI:10.1016/S1002-0721(12)60358-5