Local structure of ball-milled LaNi5 hydrogen storage material by Ni K-edge EXAFS

Benedetto Schiavo, Giacomo D'Ali'Staiti, D'Alì Staiti, Saini, Schiavo, Iadecola, Joseph, Cognigni, Olivi, Joseph

Risultato della ricerca: Articlepeer review

10 Citazioni (Scopus)

Abstract

Local structure of the nanostructured LaNi5 hydrogen storage alloys, prepared by ball-milling, has been studied using Ni K-edge extended X-ray absorption fine structure spectroscopy. Results indicate that the ball-milling up to 100 h results in the production of nanoparticles characterized by large atomic disorder and slightly reduced unit-cell volume, compared to the bulk LaNi5. High temperature annealing appears to help in partial recovery of atomic order in the ball-milled samples; however, longtime ball-milled samples retain large disorder even after the high temperature annealing. The results suggest that the large disorder and the reduced unit-cell volume might be causing a higher energybarrier for the hydride-phase formation in the long time ball-milled LaNi5 powders.
Lingua originaleEnglish
Numero di pagine0
RivistaJournal of Solid State Chemistry
Volume2010-04-30
Stato di pubblicazionePublished - 2010

All Science Journal Classification (ASJC) codes

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  • ???subjectarea.asjc.2500.2503???
  • ???subjectarea.asjc.3100.3104???
  • ???subjectarea.asjc.1600.1606???
  • ???subjectarea.asjc.1600.1604???
  • ???subjectarea.asjc.2500.2505???

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