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    Microelectronic junctions in arsenian pyrite due to impurity and mixed sulfide heterogeneity

    Access Status
    Fulltext not available
    Authors
    Laird, J.
    MacRae, C.
    Halfpenny, Angela
    Large, R.
    Ryan, C.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Laird, J. and MacRae, C. and Halfpenny, A. and Large, R. and Ryan, C. 2015. Microelectronic junctions in arsenian pyrite due to impurity and mixed sulfide heterogeneity. American Mineralogist. 100: pp. 26-34.
    Source Title
    American Mineralogist
    DOI
    10.2138/am-2015-4648
    ISSN
    0003-004X
    School
    Department of Physics and Astronomy
    URI
    http://hdl.handle.net/20.500.11937/6083
    Collection
    • Curtin Research Publications
    Abstract

    Impurities and crystal defects within the semiconducting bulk of a metal sulfide introduce energy levels within the forbidden bandgap. These levels in turn control semiconducting type and local electrical properties within single and multi-phased sulfide assemblages. Heterogeneity in sulfide semiconductivity linked to these impurities can lead to p-n micro-junction formation and potential distributions near the surface that may alter redox reactivity. Secondary gold ore genesis via a micro-galvanic effect related to heterogeneity has in the past been hypothetically linked to such micro-junctions. Understanding these regions and their interaction with weathering fluids in the regolith for example requires large-scale imaging of potential distributions associated with near-surface micro-junctions and correlation with the responsible elemental distributions. Here we investigate the existence of micro-electronic junctions in a mixed sulfide assemblage using scanning laser beam induced current (LBIC) and correlate them with pyrite-chalcopyrite interfaces mapped using combined energy-dispersive spectroscopy (EDS) and wavelength-dispersive spectroscopy (WDS) on an electron hyper-probe. Junctions in a natural assemblage are positively identified for the first time.

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