کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1622617 | 1516402 | 2009 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Hydrogen diffusivity and the anomalous transverse spin relaxation in C14-type HfCr2Hx
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The hydrogen diffusivity D in C14-type HfCr2H0.4 has been measured by means of the pulsed-field-gradient nuclear magnetic resonance over the temperature range 141-428 K. The temperature dependence of D in this range is found to deviate strongly from the Arrhenius behavior. This is consistent with a quantum nature of H diffusion in HfCr2Hx. Measurements of the proton spin-spin relaxation rate R2 in HfCr2Hx (x = 0.4, 0.6 and 0.74) have revealed the anomalous R2 peak near 230 K for all the samples studied. The experimental results indicate that this peak originates from slow fluctuations of the proton resonance frequency. Such fluctuations are expected for protons diffusing through a spatially inhomogeneous medium on the length scale of about 500 Ã
. The origin of the inhomogeneity suggested by the R2 data in HfCr2Hx remains to be elucidated.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 475, Issues 1â2, 5 May 2009, Pages 16-20
Journal: Journal of Alloys and Compounds - Volume 475, Issues 1â2, 5 May 2009, Pages 16-20
نویسندگان
A.V. Skripov, K. Ulrich, F. Grinberg, A.V. Soloninin, A.L. Buzlukov,