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    First-order phase transition in the Li2B12H12 system

    193171_193171.pdf (369.0Kb)
    Access Status
    Open access
    Authors
    Paskevicius, Mark
    Pitt, M.
    Brown, David
    Sheppard, Drew
    Chumphongphan, Somwan
    Buckley, Craig
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Paskevicius, Mark and Pitt, Mark P. and Brown, David H. and Sheppard, Drew A. and Chumphongphan, Somwan and Buckley, Craig E. 2013. First-order phase transition in the Li2B12H12 system. Physical Chemistry Chemical Physics. 15 (38): pp. 15825-15828.
    Source Title
    Physical Chemistry Chemical Physics
    DOI
    10.1039/C3CP53090F
    ISSN
    1463-9076
    URI
    http://hdl.handle.net/20.500.11937/31525
    Collection
    • Curtin Research Publications
    Abstract

    The thermal decomposition of anhydrous Pa[3 with combining macron] Li2B12H12 was studied in situ by high resolution synchrotron X-ray diffraction. A first-order phase transition can be observed at 355 °C where the unit cell volume expands by ca. 8.7%. The expanded β-Li2B12H12 polymorph simultaneously decomposes to a hydrogen poor γ-Li2B12H12−x phase. Expansion of the unit cell across the discontinuity is consistent with reorientational motion of B12H122− anions, and the presence of a frustrated Li+ lattice indicating Li ion conduction.

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