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Title

Synthesis and thermal stability of perovskite alkali metal strontium borohydrides

Authors
Møller, Kasper T.
Ley, Morten B.
Jensen, Torben R.
Published in Dalton Transactions. 2016, vol. 45, no. 2, p. 831-840
Abstract Three new perovskite-type bimetallic alkali metal strontium borohydride compounds, α-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 α-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).
Keywords Metal borohydridePerovskiteHydrogen storage
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Other version: http://xlink.rsc.org/?DOI=C5DT03590B
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Research group Groupe Cerny
Project FNS: 200020_149218
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MØLLER, Kasper T. et al. Synthesis and thermal stability of perovskite alkali metal strontium borohydrides. In: Dalton Transactions, 2016, vol. 45, n° 2, p. 831-840. https://archive-ouverte.unige.ch/unige:79031

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Deposited on : 2016-01-11

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