In-situ synchrotron X-ray diffraction investigation on hydrogen-induced decomposition of long period stacking ordered structure in Mg-Ni-Y system

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• 作者：Yang Li^a ; Qinfen Gu^b ; Qian Li^a ; ^c ; ^{shuliqian@shu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Tengfei Zhang^d ; ^{tengfei0329@gmail.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Hydrogen storage ; Nanocomposite ; Long period stacking ordered structure ; In-situ synchrotron X-ray diffraction ; Transmission electron microscope
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：127
• 期：Complete
• 页码：102-107
• 全文大小：1874 K

文摘

In-situ synchrotron X-ray diffraction (SR-XRD) combined with transmission electron microscope (TEM) and first-principle calculations was employed to reveal the mechanism of hydrogen-induced decomposition of 18R-type long period stacking ordered (LPSO) structure. 80 wt.% of the structure was decomposed by 0.05 MPa H₂ at 280 °C in 90 min, producing 6 wt.% Mg, 50 wt.% MgH₂, 15 wt.% YH₂, 9 wt.% Mg₂Ni, and 3 wt.% Mg₂NiH₄. The formation of YH₂ nanoparticles is the fastest process due to the strong interaction between hydrogen atoms and dispersive L1₂-Ni₆Y₈ clusters. Furthermore, the metastable Mg₆Ni nanocrystals, which transformed to Mg₂Ni and Mg nanoparticles, was detected.