1H NMR study of hydrogen self-diffusion in ternary Ti-V-Cr alloys

被引：9

作者：

Vyvodtceva, A. V. ^{[1
]}

Shelyapina, M. G. ^{[1
]}

Privalov, A. F. ^{[2
]}

Chernyshev, Yu. S. ^{[1
]}

Fruchart, D. ^{[3
]}

机构：

[1] St Petersburg State Univ, Fac Phys, St Petersburg 198504, Russia

[2] Tech Univ Darmstadt, Inst Ferstkoerperphys, D-64289 Darmstadt, Germany

[3] CNRS, MCMF Inst Neel, F-38042 Grenoble 9, France

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2014年 / 614卷

关键词：

Metal hydrides; Diffusion; Nuclear resonances; RELAXATION; NMR;

D O I：

10.1016/j.jallcom.2014.06.023

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Here we report on the results of proton NMR study of hydrogen self-diffusion in hydrides of Ti-V-Cr alloys of different composition, pure and with 4 wt.% of Zr7Ni10 additives, namely, TiV0.8Cr1.2H5.29, Ti0.5V1.9Cr0.6H5.03 and Ti0.33V1.27Cr1.4H1.13. The measurements have been made using the static field gradient nuclear magnetic resonance technique. The hydrogen self-diffusion coefficient at room temperature lies within the range of 1.4-3.7 x 10(-11) m(2)/s. The activation energy E-a strongly depends on the both composition and structure type of the hydride. The samples with bcc structure (and with the lowest hydrogen concentration) exhibit the highest E-a value of 0.2 eV. For the samples with fcc structure the E-a value is lower and decreases with increasing the vanadium fraction. The influence of Zr7Ni10 additives on the measured parameters is also discussed. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：364 / 367

页数：4

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