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    Nanoscale Stoichiometric Analysis of a High-Temperature Superconductor by Atom Probe Tomography

    Access Status
    Fulltext not available
    Authors
    Pedrazzini, S.
    London, A.
    Gault, B.
    Saxey, David
    Speller, S.
    Grovenor, C.
    Danaie, M.
    Moody, M.
    Edmondson, P.
    Bagot1, P.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Pedrazzini, S. and London, A. and Gault, B. and Saxey, D. and Speller, S. and Grovenor, C. and Danaie, M. et al. 2017. Nanoscale Stoichiometric Analysis of a High-Temperature Superconductor by Atom Probe Tomography. Microscopy and Microanalysis. In Press.
    Source Title
    Microscopy and Microanalysis
    DOI
    10.1017/S1431927616012757
    ISSN
    1431-9276
    School
    John de Laeter CoE in Mass Spectrometry
    URI
    http://hdl.handle.net/20.500.11937/50728
    Collection
    • Curtin Research Publications
    Abstract

    The functional properties of the high-temperature superconductor Y1Ba2Cu3O7−δ (Y-123) are closely correlated to the exact stoichiometry and oxygen content. Exceeding the critical value of 1 oxygen vacancy for every five unit cells (δ>0.2, which translates to a 1.5 at% deviation from the nominal oxygen stoichiometry of Y7.7Ba15.3Cu23O54−δ) is sufficient to alter the superconducting properties. Stoichiometry at the nanometer scale, particularly of oxygen and other lighter elements, is extremely difficult to quantify in complex functional ceramics by most currently available analytical techniques. The present study is an analysis and optimization of the experimental conditions required to quantify the local nanoscale stoichiometry of single crystal yttrium barium copper oxide (YBCO) samples in three dimensions by atom probe tomography (APT). APT analysis required systematic exploration of a wide range of data acquisition and processing conditions to calibrate the measurements. Laser pulse energy, ion identification, and the choice of range widths were all found to influence composition measurements. The final composition obtained from melt-grown crystals with optimized superconducting properties was Y7.9Ba10.4Cu24.4O57.2.

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