Investigations on the formation and decomposition behaviors of BaAlH 5 and Ba2AlH7

Xiangfeng Liu, Kohta Asano, Kouji Sakaki, Yumiko Nakamura, H. Enoki, Etsuo Akiba

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The formation and decomposition behaviors of BaAlH5 and Ba 2AlH7 were investigated by means of X-ray diffraction and pressure-composition isotherms (PCT). The phase transitions, phase compositions, and lattice parameters were determined by Rietveld refinement. Significantly pure BaAlH5 with a purity of 99.1% was obtained through hydriding of Ba4Al5 alloy at 100 °C under 5 MPa H2. When the hydrogenation temperature increased to 250 °C, the main phase became Ba2AlH7 with some impurity phases of BaAl4 and BaH2. PCT measurements of Ba4Al5 showed that the plateau pressure at 150 °C was about 0.5 MPa, and the maximum absorption H2 content was 2.15wt %. The final products obtained after PCT measurements of Ba4Al5 at 150 °C, 280 and 350 °C were BaAlH5, a mixture of Ba2AlH7, BaH 2 and BaAl4, a mixture of BaH2 and BaAl 4, respectively. Independent decomposition experiments showed that BaAlH5 partly desorbed H2 to form a mixture of BaAlH 5, Ba2AlH7, BaH2, and BaAl 4 at 280 °C, whereas both BaAlH5 and Ba 2AlH7 completely decomposed into BaH2 and BaAl4 at 350 °C.

Original languageEnglish
Pages (from-to)17423-17426
Number of pages4
JournalJournal of Physical Chemistry C
Volume112
Issue number44
DOIs
Publication statusPublished - Nov 6 2008

Fingerprint

Decomposition
Isotherms
decomposition
isotherms
Chemical analysis
Rietveld refinement
Phase composition
Hydrogenation
hydrogenation
Lattice constants
plateaus
lattice parameters
purity
Phase transitions
Impurities
X ray diffraction
impurities
products
diffraction
x rays

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Liu, X., Asano, K., Sakaki, K., Nakamura, Y., Enoki, H., & Akiba, E. (2008). Investigations on the formation and decomposition behaviors of BaAlH 5 and Ba2AlH7. Journal of Physical Chemistry C, 112(44), 17423-17426. https://doi.org/10.1021/jp806138x

Investigations on the formation and decomposition behaviors of BaAlH 5 and Ba2AlH7. / Liu, Xiangfeng; Asano, Kohta; Sakaki, Kouji; Nakamura, Yumiko; Enoki, H.; Akiba, Etsuo.

In: Journal of Physical Chemistry C, Vol. 112, No. 44, 06.11.2008, p. 17423-17426.

Research output: Contribution to journalArticle

Liu, X, Asano, K, Sakaki, K, Nakamura, Y, Enoki, H & Akiba, E 2008, 'Investigations on the formation and decomposition behaviors of BaAlH 5 and Ba2AlH7', Journal of Physical Chemistry C, vol. 112, no. 44, pp. 17423-17426. https://doi.org/10.1021/jp806138x
Liu, Xiangfeng ; Asano, Kohta ; Sakaki, Kouji ; Nakamura, Yumiko ; Enoki, H. ; Akiba, Etsuo. / Investigations on the formation and decomposition behaviors of BaAlH 5 and Ba2AlH7. In: Journal of Physical Chemistry C. 2008 ; Vol. 112, No. 44. pp. 17423-17426.
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