EXAFS Debye-Waller factors of La and Ni in LaNi5

XAFS measurements of the La L3 and Ni K-edges for LaNi5 were done at temperatures of 20, 100, 200 and 293 K. The temperature dependences of the Debye-Waller factors e-2sigma2k2 for La and Ni are deduced. The results show that mean square fluctuation in interatomic distance oz of La for LaNi5 is fair...

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Bibliographic Details
Published inJournal of alloys and compounds Vol. 390; no. 1-2; pp. 31 - 34
Main Authors MATSUURA, M, ASADA, K, KONNO, K, SAKURAI, M
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier 22.03.2005
Subjects
Exact sciences and technology
Physics
Debye temperature
Fluctuations
Hydrogen storage
Atomic position
Interatomic distances
Temperature effects
Rare earths
LaNi5
Desorption
Nickel
Debye-Waller factor
EXAFS
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Summary:XAFS measurements of the La L3 and Ni K-edges for LaNi5 were done at temperatures of 20, 100, 200 and 293 K. The temperature dependences of the Debye-Waller factors e-2sigma2k2 for La and Ni are deduced. The results show that mean square fluctuation in interatomic distance oz of La for LaNi5 is fairly large and the Debye temperature ThetaD of La changes with temperature. These results indicate that the La atom with large atomic size changes its atomic position easily in LaNi5. The large sigma2 value of A (rare earth) elements for AB5 compounds might be correlated to their high capability of the hydrogen absorption and desorption.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2004.09.026