EXAFS study of LaNi5 and LaNi4.5Al0.5

O. Palumbo, C. Castellano, A. Paolone, F. Cordero, R. Cantelli, Y. Nakamura, E. Akiba

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We report extended X-ray absorption fine structure measurements in the temperature range between 20 and 300 K at the Ni K absorption edge on LaNi5 and LaNi4.5Al0.5 before and after hydrogen charging. In agreement with previous studies, an increase of the Ni-Ni distance has been found when Ni atoms are partially substituted by Al. For all the samples, the Debye-Waller factors of the Ni-Ni first sub-shells have been fitted with a correlated Debye model plus a temperature independent static disorder, obtaining a Debye temperature dependence on the Al content. Even a small hydrogen content has been found to increase the static contribution to the local disorder around Ni atoms.

Original languageEnglish
Pages (from-to)33-36
Number of pages4
JournalJournal of Alloys and Compounds
Volume433
Issue number1-2
DOIs
Publication statusPublished - May 16 2007

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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