Dehydrogenation properties and crystal structure analysis of Mg(BH 4)(NH2)

Tatsuo Noritake, Kazutoshi Miwa, Masakazu Aoki, Mitsuru Matsumoto, Shin Ichi Towata, Hai Wen Li, Shin Ichi Orimo

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    Abstract

    Dehydrogenation properties and crystal structure of the double anion complex hydride Mg(BH4)(NH2) were studied by thermal analyses and synchrotron X-ray diffraction. The stoichiometric mixture of Mg(BH4)2 and Mg(NH2)2 were ball-milled and then heated to 453 K to form Mg(BH4)(NH2) crystal. The dehydrogenation of Mg(BH4)(NH2) occurs in two-stage at 513 K and 688 K. The following reaction sequence is suggested by the results of thermal analyses; Mg(BH4)(NH2) → MgH2 + BN + 2H2 (7.3 mass% weight loss) → Mg + BN + 3H2 (11.0 mass% weight loss in total). The dehydrogenation temperature of Mg(BH4)(NH2) is approximately 50 K lower than that of the other double anion complex Li2(BH 4)(NH2). The crystal structure of Mg(BH 4)(NH2) was determined by the measurement at 300 K (crystal system: tetragonal, space group: I41 (No. 80), lattice constants: a = 5.792(1), c = 20.632(4) Å at 300 K). In the crystal of Mg(BH4)(NH2), the cation (Mg2+) and the anions (BH4- and NH2-) are stacked alternately along the c-axis direction. The Mg 2+ cation is tetrahedrally coordinated with two BH4- anions and two NH2- anions.

    Original languageEnglish
    Pages (from-to)S85-S89
    JournalJournal of Alloys and Compounds
    Volume580
    Issue numberSUPPL1
    DOIs
    Publication statusPublished - 2013

    All Science Journal Classification (ASJC) codes

    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

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