Investigation of nanocrystalline Gd films loaded with hydrogen

Petr Hruška, Jakub Čížek, Patrik Dobroň, Wolfgang Anwand, Arndt Mücklich, Ryota Gemma, Stefan Wagner, Helmut Uchida, Astrid Pundt

    Research output: Contribution to journalArticlepeer-review

    3 Scopus citations

    Abstract

    The present work reports on microstructure studies of hydrogen-loaded nanocrystalline Gd films prepared by cold cathode beam sputtering on sapphire (112¯0) substrates. The Gd films were electrochemically step-by-step charged with hydrogen and the structural development with increasing concentration of absorbed hydrogen was studied by transmission electron microscopy and in-situ   X-ray diffraction using synchrotron radiation. The relaxation of hydrogen-induced stresses was examined by acoustic emission measurements. In the low concentration range absorbed hydrogen occupies preferentially vacancy-like defects at GBs typical for nanocrystalline films. With increasing hydrogen concentration hydrogen starts to occupy interstitial sites. At the solid solution limit the grains gradually transform into the ββ-phase (GdH2). Finally at high hydrogen concentrations xH>2.0xH>2.0 H/Gd, the film structure becomes almost completely amorphous. Contrary to bulk Gd specimens, the formation of the γγ-phase (GdH3) was not observed in this work.
    Original languageEnglish (US)
    Pages (from-to)S308-S311
    Number of pages1
    JournalJournal of Alloys and Compounds
    Volume645
    Issue numberS1
    DOIs
    StatePublished - Jan 6 2015

    ASJC Scopus subject areas

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

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