Synthesis and crystal structure analysis of complex hydride Mg(BH 4)(NH2)

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

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Complex hydride Mg(BH4)(NH2), which consists of double anion BH4- and NH2-, was synthesized and the crystal structure was analyzed by synchrotron X-ray diffraction. The mixture sample of Mg(BH4)2 + Mg(NH 2)2 prepared by ball milling was reacted and crystallized to Mg(BH4)(NH2) by heating at about 453 K. This crystal phase transforms into amorphous phase above 473 K and subsequently the dehydrogenation begins. The crystal structure of Mg(BH4)(NH 2) was determined from measurement data at 453 K (chemical formula: Mg0.94(BH4)1(NH2)0.88, crystal system: tetragonal, space group: I41 (No.80), Z = 8, lattice constants: a = 5.814(1), c = 20.450(4) Å at 453 K). Mg(BH 4)(NH2) is ionic crystal which the cation (Mg 2+) and the anions (BH4- and NH 2-) are stacking alternately along the c-axis direction. Two BH4- and two NH2- tetrahedrally coordinate around Mg2+ ion.

Original languageEnglish
Pages (from-to)6730-6735
Number of pages6
JournalInternational Journal of Hydrogen Energy
Volume38
Issue number16
DOIs
Publication statusPublished - 2013 May 30

Keywords

  • Complex hydride
  • Hydrogen storage materials
  • Synchrotron radiation
  • X-ray diffraction

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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