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

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

Research output: Contribution to journalArticle

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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 - May 30 2013

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Hydrides
hydrides
Crystal structure
anions
Crystals
crystal structure
ionic crystals
Negative ions
synthesis
dehydrogenation
crystals
balls
synchrotrons
Ball milling
Dehydrogenation
Synchrotrons
cations
Lattice constants
heating
Positive ions

All Science Journal Classification (ASJC) codes

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

Cite this

Synthesis and crystal structure analysis of complex hydride Mg(BH 4)(NH2). / Noritake, Tatsuo; Miwa, Kazutoshi; Aoki, Masakazu; Matsumoto, Mitsuru; Towata, Shin Ichi; Li, Haiwen; Orimo, Shin Ichi.

In: International Journal of Hydrogen Energy, Vol. 38, No. 16, 30.05.2013, p. 6730-6735.

Research output: Contribution to journalArticle

Noritake, T, Miwa, K, Aoki, M, Matsumoto, M, Towata, SI, Li, H & Orimo, SI 2013, 'Synthesis and crystal structure analysis of complex hydride Mg(BH 4)(NH2)', International Journal of Hydrogen Energy, vol. 38, no. 16, pp. 6730-6735. https://doi.org/10.1016/j.ijhydene.2013.03.072
Noritake, Tatsuo ; Miwa, Kazutoshi ; Aoki, Masakazu ; Matsumoto, Mitsuru ; Towata, Shin Ichi ; Li, Haiwen ; Orimo, Shin Ichi. / Synthesis and crystal structure analysis of complex hydride Mg(BH 4)(NH2). In: International Journal of Hydrogen Energy. 2013 ; Vol. 38, No. 16. pp. 6730-6735.
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AU - Noritake, Tatsuo

AU - Miwa, Kazutoshi

AU - Aoki, Masakazu

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AU - Towata, Shin Ichi

AU - Li, Haiwen

AU - Orimo, Shin Ichi

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N2 - 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.

AB - 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.

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