کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1281797 | 1497667 | 2007 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Formation of lattice strain in MmNi4.30-xCoxAl0.30Mn0.40 (x=0,0.75) during hydrogenation
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We investigated the hydrogenation mechanism of MmNi4.30-xCoxAl0.30Mn0.40 (Mm: misch metal, x=0, 0.75) by means of in situ X-ray diffraction (XRD) measurement. Formation of lattice strain and change of crystallite size for both the solid solution phase and the hydride phase were analyzed by the Rietveld refinement of XRD profiles. In MmNi4.30Al0.30Mn0.40, the isotropic lattice strain showed less than 0.8% for both the phases through the whole range of hydrogen content, and anisotropic strain was not observed. The crystallite size for both the phases showed around 100Â nm, which did not change significantly during hydrogenation and dehydrogenation. In MmNi3.55Co0.75Al0.30Mn0.40, the isotropic strain for both the phases depended on the fraction of each phase. It reached the maximum of 1.2% around the phase fraction of 0.5, while anisotropic strain was not observed. The crystallite size for both the phases showed around 100Â nm through the whole range of hydrogen content. This result indicates that the solid solution phase changes to the hydride phase domain by domain during hydrogenation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 32, Issue 17, December 2007, Pages 4202-4208
Journal: International Journal of Hydrogen Energy - Volume 32, Issue 17, December 2007, Pages 4202-4208
نویسندگان
Daisuke Endo, Kouji Sakaki, Etsuo Akiba,