کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9803238 | 1516463 | 2005 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Hydrogen absorption in Ti-Zr-Ni quasicrystals and 1/1 approximants
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
Ti/Zr-based quasicrystals and their approximants draw attention as new candidate materials for hydrogen storage applications based on recent discoveries that they absorb a large amount of hydrogen, reversibly, at low temperatures and pressures. In fact, Ti45Zr38Ni17 quasicrystals take hydrogen to a maximum value of hydrogen to host metal atom ratio (H/M) of nearly 2. To evaluate their technical usefulness and to probe the local structure of the quasicrystals, pressure-composition isotherms (p -c -T) were measured above 250â° C using a computer-controlled apparatus. In the Ti-Zr-Ni quasicrystal, the p -c -T curves do not exhibit a clear pressure plateau. Instead, the equilibrium vapor pressure remains low (< 5âTorr) below H/Mâ1 and increases sharply for increasing H/M. In the Ti-Zr-Ni 1/1 approximant phase, which is a large unit cell bcc structure (a=13.13 Ã
), the p -c -T measurements show similar curves with a hint of pressure plateau consistent with a structural similarity between the phases. The quasicrystals desorb most of the absorbed hydrogen above 600â° C for 2âh in dynamical vacuum without phase transformation, and they do not become powder, even after a few absorption-desorption cycles. Interestingly, a small amount of Pd inhibits the growth of the (Ti,Zr)Hx hydride phase during hydrogenation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volumes 404â406, 8 December 2005, Pages 388-391
Journal: Journal of Alloys and Compounds - Volumes 404â406, 8 December 2005, Pages 388-391
نویسندگان
J.Y. Kim, R. Hennig, V.T. Huett, P.C. Gibbons, K.F. Kelton,