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    Synthesis and thermal stability of perovskite alkali metal strontium borohydrides

    Access Status
    Fulltext not available
    Authors
    Moller, Kasper
    Ley, M.
    Schouwink, P.
    Cerný, R.
    Jensen, T.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Moller, K. and Ley, M. and Schouwink, P. and Cerný, R. and Jensen, T. 2015. Synthesis and thermal stability of perovskite alkali metal strontium borohydrides. Dalton Transactions. 45 (2): pp. 831-840.
    Source Title
    Dalton Transactions
    DOI
    10.1039/c5dt03590b
    ISSN
    1477-9226
    School
    School of Electrical Engineering, Computing and Mathematical Science (EECMS)
    URI
    http://hdl.handle.net/20.500.11937/70795
    Collection
    • Curtin Research Publications
    Abstract

    © 2016 The Royal Society of Chemistry. Three new perovskite-type bimetallic alkali metal strontium borohydride compounds, a-MSr(BH4)3 (M = K, Rb, Cs), have been synthesized and investigated by in situ synchrotron radiation powder X-ray diffraction, thermal analysis combined with mass spectrometry and Sievert's measurements. The bimetallic borohydrides were synthesized via an addition reaction between Sr(BH4)2 and MBH4 (M = K, Rb, Cs) by mechanochemical treatment. The Sr(BH4)2-NaBH4 system, which was treated in a similar manner, did not undergo reaction. All three a-MSr(BH4)3 compounds crystallize in the orthorhombic crystal system at room temperature: KSr(BH4)3 (P21cn), a = 7.8967(6), b = 8.2953(7), and c = 11.508(1) Å (V = 753.82(12) Å3). RbSr(BH4)3 (Pbn21), a = 8.0835(3), b = 8.3341(4), and c = 11.6600(5) Å (V = 785.52(6) Å3). CsSr(BH4)3 (P22121), a = 8.2068(9), b = 8.1793(9), and c = 6.0761(4) Å (V = 407.87(7) Å3). All three compounds are perovskite-type 3D framework structures built from distorted [Sr(BH4)6] octahedra. High-temperature polymorphs are identified to form at 258, 220 and 150°C for MSr(BH4)3, M = K, Rb and Cs, respectively. The new compounds are thermally stable and decompose at T > 360°C into SrB6, SrH2 and MBH4 (M = K, Rb, Cs).

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