کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1627129 | 1516448 | 2006 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Pulsed-field-gradient NMR study of hydrogen diffusivity in random b.c.c. alloys VyTa1ây
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Hydrogen diffusion coefficients D in disordered b.c.c. systems VyTa1âyH0.07 (y = 0.25, 0.50 and 0.75) have been measured by means of the pulsed-field-gradient nuclear magnetic resonance over the temperature range 190-435 K. The hydrogen diffusivities are found to depend strongly on the alloy composition, the room-temperature value of D in the sample with y = 0.75 being an order of magnitude higher than those in the samples with y = 0.25 and 0.50. For all the samples studied, the temperature dependences of H diffusivity follow the Arrhenius law with the activation energies of 0.186 eV (y = 0.25, 306-410 K), 0.182 eV (y = 0.50, 295-401 K) and 0.102 eV (y = 0.75, 190-435 K). These values are in reasonable agreement with those obtained from the proton spin-lattice relaxation measurements reported earlier. The jump lengths of H atoms have been estimated by comparing the measured H diffusivities with the proton spin-lattice relaxation data.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 425, Issues 1â2, 30 November 2006, Pages 24-27
Journal: Journal of Alloys and Compounds - Volume 425, Issues 1â2, 30 November 2006, Pages 24-27
نویسندگان
F. Grinberg, G. Majer, A.V. Skripov,