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 language | English |
|---|---|
| Pages (from-to) | 17423-17426 |
| Number of pages | 4 |
| Journal | Journal of Physical Chemistry C |
| Volume | 112 |
| Issue number | 44 |
| DOIs | |
| Publication status | Published - Nov 6 2008 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Energy(all)
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
Cite this
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 journal › Article
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TY - JOUR
T1 - Investigations on the formation and decomposition behaviors of BaAlH 5 and Ba2AlH7
AU - Liu, Xiangfeng
AU - Asano, Kohta
AU - Sakaki, Kouji
AU - Nakamura, Yumiko
AU - Enoki, H.
AU - Akiba, Etsuo
PY - 2008/11/6
Y1 - 2008/11/6
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=56549096909&partnerID=8YFLogxK
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U2 - 10.1021/jp806138x
DO - 10.1021/jp806138x
M3 - Article
AN - SCOPUS:56549096909
VL - 112
SP - 17423
EP - 17426
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 44
ER -