Abstract
The intermetallic compound Pr5Ni19, which is not shown in the Pr-Ni binary phase diagram, was synthesized, and the crystal structure was investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Two superlattice reflections with the Sm5Co 19-type structure (002 and 004) and the Pr5Co 19-type structure (003 and 006) were observed in the 2θ region between 2° and 15° in the XRD pattern using Cu Kα radiation. Rietveld refinement provided the goodness-of-fit parameter S = 6.7 for the Pr5Co19-type (3R) structure model and S = 1.7 for the Sm5Co19-type (2H) structure model, indicating that the synthesized compound has a Sm5Co19 structure. The refined lattice parameters were a = 0.50010(9) nm and c = 3.2420(4) nm. The high-resolution TEM image also clearly revealed that the crystal structure of Pr5Ni19 is of the Sm5Co19 type, which agrees with the results from Rietveld refinement of the XRD data. The P-C isotherm of Pr5Ni19 in the first absorption was clearly different from that in the first desorption. A single plateau in absorption and three plateaus in desorption were observed. The maximum hydrogen storage capacity of the first cycle reached 1.1 H/M, and that of the second cycle was 0.8 H/M. The 0.3 H/M of hydrogen remained in the metal lattice after the first desorption process.
| Original language | English |
|---|---|
| Pages (from-to) | 4548-4552 |
| Number of pages | 5 |
| Journal | Inorganic Chemistry |
| Volume | 50 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - May 16 2011 |
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All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
- Inorganic Chemistry
Cite this
Synthesis and crystal structure of a Pr5Ni19 superlattice alloy and its hydrogen absorption-desorption property. / Iwase, Kenji; Sakaki, Kouji; Matsuda, Junko; Nakamura, Yumiko; Ishigaki, Toru; Akiba, Etsuo.
In: Inorganic Chemistry, Vol. 50, No. 10, 16.05.2011, p. 4548-4552.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Synthesis and crystal structure of a Pr5Ni19 superlattice alloy and its hydrogen absorption-desorption property
AU - Iwase, Kenji
AU - Sakaki, Kouji
AU - Matsuda, Junko
AU - Nakamura, Yumiko
AU - Ishigaki, Toru
AU - Akiba, Etsuo
PY - 2011/5/16
Y1 - 2011/5/16
N2 - The intermetallic compound Pr5Ni19, which is not shown in the Pr-Ni binary phase diagram, was synthesized, and the crystal structure was investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Two superlattice reflections with the Sm5Co 19-type structure (002 and 004) and the Pr5Co 19-type structure (003 and 006) were observed in the 2θ region between 2° and 15° in the XRD pattern using Cu Kα radiation. Rietveld refinement provided the goodness-of-fit parameter S = 6.7 for the Pr5Co19-type (3R) structure model and S = 1.7 for the Sm5Co19-type (2H) structure model, indicating that the synthesized compound has a Sm5Co19 structure. The refined lattice parameters were a = 0.50010(9) nm and c = 3.2420(4) nm. The high-resolution TEM image also clearly revealed that the crystal structure of Pr5Ni19 is of the Sm5Co19 type, which agrees with the results from Rietveld refinement of the XRD data. The P-C isotherm of Pr5Ni19 in the first absorption was clearly different from that in the first desorption. A single plateau in absorption and three plateaus in desorption were observed. The maximum hydrogen storage capacity of the first cycle reached 1.1 H/M, and that of the second cycle was 0.8 H/M. The 0.3 H/M of hydrogen remained in the metal lattice after the first desorption process.
AB - The intermetallic compound Pr5Ni19, which is not shown in the Pr-Ni binary phase diagram, was synthesized, and the crystal structure was investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Two superlattice reflections with the Sm5Co 19-type structure (002 and 004) and the Pr5Co 19-type structure (003 and 006) were observed in the 2θ region between 2° and 15° in the XRD pattern using Cu Kα radiation. Rietveld refinement provided the goodness-of-fit parameter S = 6.7 for the Pr5Co19-type (3R) structure model and S = 1.7 for the Sm5Co19-type (2H) structure model, indicating that the synthesized compound has a Sm5Co19 structure. The refined lattice parameters were a = 0.50010(9) nm and c = 3.2420(4) nm. The high-resolution TEM image also clearly revealed that the crystal structure of Pr5Ni19 is of the Sm5Co19 type, which agrees with the results from Rietveld refinement of the XRD data. The P-C isotherm of Pr5Ni19 in the first absorption was clearly different from that in the first desorption. A single plateau in absorption and three plateaus in desorption were observed. The maximum hydrogen storage capacity of the first cycle reached 1.1 H/M, and that of the second cycle was 0.8 H/M. The 0.3 H/M of hydrogen remained in the metal lattice after the first desorption process.
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U2 - 10.1021/ic200253w
DO - 10.1021/ic200253w
M3 - Article
C2 - 21500776
AN - SCOPUS:79955857823
VL - 50
SP - 4548
EP - 4552
JO - Inorganic Chemistry
JF - Inorganic Chemistry
SN - 0020-1669
IS - 10
ER -