NMR study of the nanocrystalline palladium-hydrogen system

被引：19

作者：

Hanneken, JW

Baker, DB

Conradi, MS

Eastman, JA

机构：

[1] William Jewell Coll, Dept Phys, Liberty, MO 64068 USA

[2] Univ Memphis, Dept Phys, Memphis, TN 38152 USA

[3] Washington Univ, Dept Phys 1105, St Louis, MO 63130 USA

[4] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2002年 / 330卷

关键词：

metals; nanostructures; nuclear resonances; grain boundaries;

D O I：

10.1016/S0925-8388(01)01498-0

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：

Proton nuclear magnetic resonance spectra of nanocrystalline n-PdH0.7 at room temperature reveal two distinct, motionally-narrowed peaks, attributed to crystallite interstitial and interfacial hydrogen populations. In addition, proton spin-lattice relaxation measurements show enhanced relaxation rates. Both results are qualitatively consistent with a previously-observed hydrogen concentration enhancement in grain boundaries of alpha-phase n-PdHx. Magnetization recovery data for n-PdH0.7 also reveal that the separate populations of hydrogen do not exchange on time scales of up to order 0.1 s, a surprising result considering the correlation time associated with spin-lattice relaxation, of order 10(-8) s. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：714 / 717

页数：4

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