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In-situ atomic-scale phase transformation of Mg under hydrogen conditions.

Peng, Qiuming; Sun, Yong; Ge, Bingcheng; Feng, Jiawen; Guo, Jianxin; Fernandez, Carlos; Huang, Jianyu


Qiuming Peng

Yong Sun

Bingcheng Ge

Jiawen Feng

Jianxin Guo

Jianyu Huang


Magnesium hydrogenation issue poses a serious obstacle to designing strong and reliable structural materials, as well as offering a safe alternative for hydrogen applications. Understanding phase transformation of magnesium under hydrogen gas plays an essential role in developing high performance structural materials and hydrogen storage materials. Herein, we report in-situ atomic-scale observations of phase transformation of Mg and Mg-1wt.%Pd alloy under hydrogen conditions in an aberration-corrected environmental transmission electron microscopy. Compare with magnesium hydrogenation reaction, magnesium oxidation reaction predominately occurs at room temperature even under pure hydrogen gas (99.9%). In comparison, magnesium hydrogenation is readily detected in the interface between Mg and Mg6Pd, due to catalytic role of Mg6Pd. Note that the nanoscale MgH2 compound transfers into MgO spontaneously, and the interface strain remarkably varies during phase transformation. These atomic-level observations and calculations provide fundamental knowledge to elucidate the issue of magnesium hydrogenation.


PENG, Q., SUN, Y., GE, B., FENG, J., GUO, J., FERNANDEZ, C. and HUANG, J. 2018. In-situ atomic-scale phase transformation of Mg under hydrogen conditions. Journal of physical chemistry C [online], 122(34), pages 19532-19539. Available from:

Journal Article Type Article
Acceptance Date Aug 9, 2018
Online Publication Date Aug 9, 2018
Publication Date Aug 30, 2018
Deposit Date Aug 16, 2018
Publicly Available Date Aug 10, 2019
Journal Journal of physical chemistry C
Print ISSN 1932-7447
Electronic ISSN 1932-7455
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 122
Issue 34
Pages 19532-19539
Keywords Magnesium; Hydride; Growth; Phase transformation
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