Effect of substitutional Mo on diffusion and site occupation of hydrogen in the BCT monohydride phase of V-H system studied by 1H NMR

被引：23

作者：

Asano, Kohta ^{[1
]}

Hayashi, Shigenobu ^{[1
]}

Nakamura, Yumiko ^{[1
]}

Akiba, Etsuo ^{[1
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058565, Japan

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2010年 / 507卷 / 02期

关键词：

Hydrogen storage materials; Metal hydrides; V-Mo alloys; Diffusion; Nuclear magnetic resonance (NMR); H-2; NMR; DESORPTION PROPERTIES; CRYSTAL-STRUCTURE; SOLID-SOLUTION; ALLOYS; VANADIUM; DEUTERIUM; ABSORPTION; TRANSITION; ISOTOPES;

D O I：

10.1016/j.jallcom.2010.08.018

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：

The diffusion and site occupation of hydrogen in the monohydride phase of V1-xMox-H (0 <= x <= 0.1) were studied by means of H-1 nuclear magnetic resonance (NMR). Hydrogen atoms in VH0.68 occupied the octahedral (O) sites in a body centered tetragonal (BCT) structure. The addition of Mo to V reduced the activation energy for hydrogen diffusion, E-H, for the O sites. In V0.9Mo0.1H0.68 hydrogen atoms occupied both the O and tetrahedral (T) sites, which was demonstrated by two components observed in the temperature dependence of the H-1 spin-lattice relaxation time. The value of E-H for the T sites was lower than that for the O sites. Hydrogen atoms in V0.9Mo0.1H0.68 diffused faster than those in VH0.68. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：399 / 404

页数：6

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