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    Chloride substitution induced by mechano-chemical reactions between NaBH 4 and transition metal chlorides

    Access Status
    Fulltext not available
    Authors
    Llamas-Jansa, I.
    Aliouane, N.
    Deledda, S.
    Fonnelop, J.
    Frommen, C.
    Humphries, Terry
    Lieutenant, K.
    Sartori, S.
    Sorby, M.
    Hauback, B.
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Llamas-Jansa, I. and Aliouane, N. and Deledda, S. and Fonnelop, J. and Frommen, C. and Humphries, T. and Lieutenant, K. et al. 2012. Chloride substitution induced by mechano-chemical reactions between NaBH 4 and transition metal chlorides. Journal of Alloys and Compounds. 530: pp. 186-192.
    Source Title
    Journal of Alloys and Compounds
    DOI
    10.1016/j.jallcom.2012.02.167
    ISSN
    0925-8388
    School
    Department of Physics and Astronomy
    URI
    http://hdl.handle.net/20.500.11937/17226
    Collection
    • Curtin Research Publications
    Abstract

    Cl - to BH4- ion substitution was induced in NaBH 4 through mechano-chemical reactions with all the first period transition metal chlorides and CdCl 2. The products were identified by Rietveld refinement of powder X-ray and neutron diffraction data to be mainly Na(BH 4) 1-xCl x. These possess cubic NaCl-type structures, with unit cell parameters between 5.7801(3) and 5.6576(2), and compositions ranging from x = 0.69 (with Cu) to 0.92 (with Zn). Infrared spectroscopy of selected samples confirms the substitution through a shift of the vibrational modes of the BH4- group towards higher wavenumbers. An observed shape change of the vibrational features from Lorentzian to Gaussian is related to the presence of the transition metal. There is no correlation between x and the thermal behavior of the samples. The lowest decomposition temperature is found for the Zn containing sample (103 °C), while Cd leads to the highest value (521 °C). Their behavior is related to the presence of NaZn(BH 4) 3 and metallic Cd in the samples, respectively. © 2011 Elsevier B.V. All rights reserved.

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