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Dehydrogenation properties and crystal structure analysis of Mg(BH4)(NH2)
- Source :
- Journal of Alloys and Compounds. 580:S85-S89
- Publication Year :
- 2013
- Publisher :
- Elsevier BV, 2013.
-
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(BH4)(NH2). The crystal structure of Mg(BH4)(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) A at 300 K). In the crystal of Mg(BH4)(NH2), the cation (Mg2+) and the anions ( BH 4 - and NH 2 - ) are stacked alternately along the c-axis direction. The Mg2+ cation is tetrahedrally coordinated with two BH 4 - anions and two NH 2 - anions.
Details
- ISSN :
- 09258388
- Volume :
- 580
- Database :
- OpenAIRE
- Journal :
- Journal of Alloys and Compounds
- Accession number :
- edsair.doi...........23f0811a77763a695113f569d7289873