Synthesis and crystal structure of a Pr5Ni19 superlattice alloy and its hydrogen absorption-desorption property

Kenji Iwase, Kouji Sakaki, Junko Matsuda, Yumiko Nakamura, Toru Ishigaki, Etsuo Akiba

Research output: Contribution to journalArticle

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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 languageEnglish
Pages (from-to)4548-4552
Number of pages5
JournalInorganic Chemistry
Volume50
Issue number10
DOIs
Publication statusPublished - May 16 2011

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Hydrogen
Desorption
Rietveld refinement
Crystal structure
desorption
Model structures
X ray diffraction
crystal structure
plateaus
hydrogen
synthesis
goodness of fit
transmission electron microscopy
cycles
x rays
Hydrogen storage
High resolution transmission electron microscopy
diffraction
Diffraction patterns
Lattice constants

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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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 journalArticle

Iwase, Kenji ; Sakaki, Kouji ; Matsuda, Junko ; Nakamura, Yumiko ; Ishigaki, Toru ; Akiba, Etsuo. / Synthesis and crystal structure of a Pr5Ni19 superlattice alloy and its hydrogen absorption-desorption property. In: Inorganic Chemistry. 2011 ; Vol. 50, No. 10. pp. 4548-4552.
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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.",
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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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