title: Synthesis and thermal stability of perovskite alkali metal strontium borohydrides.
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) Å(3)). RbSr(BH4)3 (Pbn21), a = 8.0835(3), b = 8.3341(4), and c = 11.6600(5) Å (V = 785.52(6) Å(3)). CsSr(BH4)3 (P22121), a = 8.2068(9), b = 8.1793(9), and c = 6.0761(4) Å (V = 407.87(7) Å(3)). 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).
authors.affiliation: Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, University of Aarhus, DK-8000 Aarhus, Denmark. trj@chem.au.dk.
authors.forename: Kasper T
authors.initials: KT
authors.lastname: Møller
authors.affiliation: Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, University of Aarhus, DK-8000 Aarhus, Denmark. trj@chem.au.dk and Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany.
authors.forename: Morten B
authors.initials: MB
authors.lastname: Ley
authors.affiliation: Laboratory of Crystallography, DQMP, University of Geneva, CH-1211 Geneva, Switzerland.
authors.forename: Pascal
authors.initials: P
authors.lastname: Schouwink
authors.affiliation: Laboratory of Crystallography, DQMP, University of Geneva, CH-1211 Geneva, Switzerland.
authors.forename: Radovan
authors.initials: R
authors.lastname: Černý
authors.affiliation: Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, University of Aarhus, DK-8000 Aarhus, Denmark. trj@chem.au.dk.
authors.forename: Torben R
authors.initials: TR
authors.lastname: Jensen