Ultrafine particles of Ni and FeCr studied by positron annihilation

Morten Mostgaard Eldrup, N.J. Pedersen, S.A. Sethi, Allan Schrøder Pedersen, B. Larsen

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

    Abstract

    Ultrafine particles of Ni and Fe80Cr20 have been produced by the gas condensation technique. After surface oxidation the paticles were heated in a reducing H2 atmosphere and positron lifetime and Doppler broadening measurements were carried out. Reduction of the oxide on the Ni powder takes place at about 350K and at about 650K for the FeCr powder. Electron microscopy shows sintering of the Ni particles above 450K, and the present results show that defects develop in the growing particles.

    Original languageEnglish
    Title of host publicationPositron Annihilation ICPA-10
    Volume1-2
    Publication date1995
    Pages149-152
    ISBN (Print)0-87849-686-6
    DOIs
    Publication statusPublished - 1995
    Event10th International Conference on Positron Annihilation - Beijing, China
    Duration: 23 May 199429 May 1994

    Conference

    Conference10th International Conference on Positron Annihilation
    CountryChina
    CityBeijing
    Period23/05/199429/05/1994
    SeriesMaterials Science Forum
    Volume175-178
    ISSN0255-5476

    Keywords

    • Ultrafine particles
    • Surface oxides
    • Reduction
    • Sintering
    • Ni
    • Fe-Cr alloys
    • Positron annihilation
    • Positron trapping
    • Positronium
    • Spin flip

    Fingerprint Dive into the research topics of 'Ultrafine particles of Ni and FeCr studied by positron annihilation'. Together they form a unique fingerprint.

    Cite this