Large atomic disorder in nanostructured LaNi5 alloys: A La L3-edge extended X-ray absorption fine structure study

被引：11

作者：

Joseph, B. ^{[1
]}

Iadecola, A. ^{[1
]}

Schiavo, B. ^{[2
,3
]}

Cognigni, A. ^{[4
]}

Olivi, L. ^{[4
]}

Saini, N. L. ^{[1
]}

机构：

[1] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[2] Base ASI Luigi Broglio, Ist Tecnol Avanzate, I-9100 Trapani, Italy

[3] Univ Palermo, Dipartimento Fis & Tecnol Relat, I-90100 Palermo, Italy

[4] Elettra Sincrotrone Trieste SCpA, I-34012 Trieste, Italy

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2010年 / 71卷 / 08期

关键词：

LaNi5; alloys; Nanostructuring; EXAFS; Crystal structure; HYDROGEN-STORAGE MATERIALS; 1ST-PRINCIPLES; MAGNESIUM; CLUSTERS; HYDRIDES; ENERGY;

D O I：

10.1016/j.jpcs.2010.03.008

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Local structure of the nanostructured LaNi5 alloys, prepared by ball-milling, has been studied using La L-3-edge extended X-ray absorption fine structure spectroscopy. The near-neighbor distances tend to decrease with the ball-milling, and the mean square relative displacements (MSRD) show substantial increase suggesting an increased atomic disorder. High temperature annealing helps in partial recovery of atomic order in the ball-milled samples for milling times upto 20 h, however, the long-time ball-milled samples seems to gain only a local random order. The results suggest that reduced unit-cell volume together with large atomic-disorder might be causing a higher energy-barrier for the hydridephase formation in the long time ball-milled LaNi5 powders. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：1069 / 1072

页数：4

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