Abstract
Nano-structured functional materials are expected to have superior properties to the coarse-grained, bulk materials. In the present paper, pure palladium is refined to nano-sized state to investigate the hydrogen absorption and desorption behavior. Using the bulk mechanical alloying, the palladium platelets can be successfully refined to nano-sized grains with the order to 10 nm. In comparison of pressure composition isotherms between nano-sized and bulk palladium, the phase boundary of the Pd-H miscibility gap is significantly narrower for nano-Pd. While the hydrogen solubility at α/(α + β) phase boundary is much increased, that at β/(α + β) phase boundary is drastically reduced by nano-structuring. This might be because of the broadening of the site energy distribution, induced by the intrinsic strains constraining the nano-grains. The broadening mechanism of site energy distribution has direct influence on the hydrogen absorption and desorption processes. The Curie temperature for hydrogen adsorption and desorption is drastically reduced by 135 K through the nanostructuring. The above precise discussion helps us to make nanostructured material design in the hydrogen storage alloys and compounds.
| Original language | English |
|---|---|
| Pages (from-to) | 960-965 |
| Number of pages | 6 |
| Journal | Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy |
| Volume | 48 |
| Issue number | 10 |
| Publication status | Published - 2001 Oct |
| Externally published | Yes |
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Keywords
- Bulk mechanical alloying
- Hydrogen absorption behavior
- Hydrogen desorption behavior
- Hydrogen storage properties
- Intrinsic strains
- Nano-structuring
- Palladium
- Site energy distribution
ASJC Scopus subject areas
- Mechanical Engineering
- Metals and Alloys
Cite this
Hydrogen absorbing characteristics of nano-structured palladium via bulk mechanical alloying. / Aizawa, Tatsuhiko; Kuji, Toshiro; Nakano, Hiroaki.
In: Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy, Vol. 48, No. 10, 10.2001, p. 960-965.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Hydrogen absorbing characteristics of nano-structured palladium via bulk mechanical alloying
AU - Aizawa, Tatsuhiko
AU - Kuji, Toshiro
AU - Nakano, Hiroaki
PY - 2001/10
Y1 - 2001/10
N2 - Nano-structured functional materials are expected to have superior properties to the coarse-grained, bulk materials. In the present paper, pure palladium is refined to nano-sized state to investigate the hydrogen absorption and desorption behavior. Using the bulk mechanical alloying, the palladium platelets can be successfully refined to nano-sized grains with the order to 10 nm. In comparison of pressure composition isotherms between nano-sized and bulk palladium, the phase boundary of the Pd-H miscibility gap is significantly narrower for nano-Pd. While the hydrogen solubility at α/(α + β) phase boundary is much increased, that at β/(α + β) phase boundary is drastically reduced by nano-structuring. This might be because of the broadening of the site energy distribution, induced by the intrinsic strains constraining the nano-grains. The broadening mechanism of site energy distribution has direct influence on the hydrogen absorption and desorption processes. The Curie temperature for hydrogen adsorption and desorption is drastically reduced by 135 K through the nanostructuring. The above precise discussion helps us to make nanostructured material design in the hydrogen storage alloys and compounds.
AB - Nano-structured functional materials are expected to have superior properties to the coarse-grained, bulk materials. In the present paper, pure palladium is refined to nano-sized state to investigate the hydrogen absorption and desorption behavior. Using the bulk mechanical alloying, the palladium platelets can be successfully refined to nano-sized grains with the order to 10 nm. In comparison of pressure composition isotherms between nano-sized and bulk palladium, the phase boundary of the Pd-H miscibility gap is significantly narrower for nano-Pd. While the hydrogen solubility at α/(α + β) phase boundary is much increased, that at β/(α + β) phase boundary is drastically reduced by nano-structuring. This might be because of the broadening of the site energy distribution, induced by the intrinsic strains constraining the nano-grains. The broadening mechanism of site energy distribution has direct influence on the hydrogen absorption and desorption processes. The Curie temperature for hydrogen adsorption and desorption is drastically reduced by 135 K through the nanostructuring. The above precise discussion helps us to make nanostructured material design in the hydrogen storage alloys and compounds.
KW - Bulk mechanical alloying
KW - Hydrogen absorption behavior
KW - Hydrogen desorption behavior
KW - Hydrogen storage properties
KW - Intrinsic strains
KW - Nano-structuring
KW - Palladium
KW - Site energy distribution
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UR - http://www.scopus.com/inward/citedby.url?scp=0035493181&partnerID=8YFLogxK
M3 - Article
VL - 48
SP - 960
EP - 965
JO - Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
JF - Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
SN - 0532-8799
IS - 10
ER -