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

Benedetto Schiavo, Saini, Schiavo, Iadecola, Cognigni, Olivi, Joseph

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    6 Citazioni (Scopus)

    Abstract

    Local structure of the nanostructured LaNi5 alloys, prepared by ball-milling, has been studied using La L3-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 hydride-phase formation in the long time ball-milled LaNi5 powders.
    Lingua originaleEnglish
    Numero di pagine4
    RivistaJournal of Physics and Chemistry of Solids
    Volume2010
    Stato di pubblicazionePublished - 2010

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    X ray absorption
    Ball milling
    balls
    fine structure
    disorders
    Extended X ray absorption fine structure spectroscopy
    Energy barriers
    Hydrides
    Powders
    x rays
    Annealing
    Recovery
    hydrides
    Temperature
    recovery
    annealing
    cells
    spectroscopy
    energy

    All Science Journal Classification (ASJC) codes

    • Chemistry(all)
    • Materials Science(all)
    • Condensed Matter Physics

    Cita questo

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    title = "Large atomic disorder in nanostructured LaNi5 alloys: A La L3-edge extended X-ray absorption fine structure study",
    abstract = "Local structure of the nanostructured LaNi5 alloys, prepared by ball-milling, has been studied using La L3-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 hydride-phase formation in the long time ball-milled LaNi5 powders.",
    keywords = "Crystal structure, EXAFS, LaNi5 alloys, Nanostructuring",
    author = "Benedetto Schiavo and Saini and Schiavo and Iadecola and Cognigni and Olivi and Joseph",
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    language = "English",
    volume = "2010",
    journal = "Journal of Physics and Chemistry of Solids",
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    TY - JOUR

    T1 - Large atomic disorder in nanostructured LaNi5 alloys: A La L3-edge extended X-ray absorption fine structure study

    AU - Schiavo, Benedetto

    AU - Saini, null

    AU - Schiavo, null

    AU - Iadecola, null

    AU - Cognigni, null

    AU - Olivi, null

    AU - Joseph, null

    PY - 2010

    Y1 - 2010

    N2 - Local structure of the nanostructured LaNi5 alloys, prepared by ball-milling, has been studied using La L3-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 hydride-phase formation in the long time ball-milled LaNi5 powders.

    AB - Local structure of the nanostructured LaNi5 alloys, prepared by ball-milling, has been studied using La L3-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 hydride-phase formation in the long time ball-milled LaNi5 powders.

    KW - Crystal structure

    KW - EXAFS

    KW - LaNi5 alloys

    KW - Nanostructuring

    UR - http://hdl.handle.net/10447/50145

    M3 - Article

    VL - 2010

    JO - Journal of Physics and Chemistry of Solids

    JF - Journal of Physics and Chemistry of Solids

    SN - 0022-3697

    ER -