Hydrogenation of Ti-Zr-Ni quasicrystals synthesized by mechanical alloying

Akito Takasaki, V. T. Huett, K. F. Kelton

研究成果: Article

32 引用 (Scopus)

抄録

Mechanical alloying of a Ti45Zr38Ni17 powder mixture formed an amorphous phase, but subsequent annealing caused the formation of an icosahedral (i) quasicrystal phase with a small amount of the Ti2Ni-type crystal phase. After high-pressure hydrogenation at 573 K at a hydrogen pressure of 3.8 MPa, the amorphous phase transformed to a TiH 2-type hydride, while the i-phase was structurally stable even after the hydrogenation. The maximum hydrogen concentration for the high-pressure hydrogenation was the same (hydrogen-to-metal atom ratio ≈1.5) for the i-phase and amorphous powders, suggesting structural similarities between the i-phase and the amorphous phase. Pressure-composition isotherms (PCTs), measured under low-pressure hydrogenation at a temperature of 423 K, showed sloping plateau-like features at equilibrium hydrogen pressures lower than 1 kPa for both the i-phase and amorphous powders. The plateau-like region for the i-phase powder was steeper and narrower than that for the amorphous powder, indicating a slight difference in site energy distribution of hydrogen in the i-phase and the amorphous phase.

元の言語English
ページ(範囲)457-460
ページ数4
ジャーナルJournal of Non-Crystalline Solids
334-335
DOI
出版物ステータスPublished - 2004 3 15

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Quasicrystals
Mechanical alloying
alloying
Hydrogenation
hydrogenation
Powders
Hydrogen
hydrogen
plateaus
low pressure
hydrides
energy distribution
isotherms
Hydrides
Isotherms
annealing
Metals
Annealing
metals
crystals

ASJC Scopus subject areas

  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials

これを引用

Hydrogenation of Ti-Zr-Ni quasicrystals synthesized by mechanical alloying. / Takasaki, Akito; Huett, V. T.; Kelton, K. F.

:: Journal of Non-Crystalline Solids, 巻 334-335, 15.03.2004, p. 457-460.

研究成果: Article

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abstract = "Mechanical alloying of a Ti45Zr38Ni17 powder mixture formed an amorphous phase, but subsequent annealing caused the formation of an icosahedral (i) quasicrystal phase with a small amount of the Ti2Ni-type crystal phase. After high-pressure hydrogenation at 573 K at a hydrogen pressure of 3.8 MPa, the amorphous phase transformed to a TiH 2-type hydride, while the i-phase was structurally stable even after the hydrogenation. The maximum hydrogen concentration for the high-pressure hydrogenation was the same (hydrogen-to-metal atom ratio ≈1.5) for the i-phase and amorphous powders, suggesting structural similarities between the i-phase and the amorphous phase. Pressure-composition isotherms (PCTs), measured under low-pressure hydrogenation at a temperature of 423 K, showed sloping plateau-like features at equilibrium hydrogen pressures lower than 1 kPa for both the i-phase and amorphous powders. The plateau-like region for the i-phase powder was steeper and narrower than that for the amorphous powder, indicating a slight difference in site energy distribution of hydrogen in the i-phase and the amorphous phase.",
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N2 - Mechanical alloying of a Ti45Zr38Ni17 powder mixture formed an amorphous phase, but subsequent annealing caused the formation of an icosahedral (i) quasicrystal phase with a small amount of the Ti2Ni-type crystal phase. After high-pressure hydrogenation at 573 K at a hydrogen pressure of 3.8 MPa, the amorphous phase transformed to a TiH 2-type hydride, while the i-phase was structurally stable even after the hydrogenation. The maximum hydrogen concentration for the high-pressure hydrogenation was the same (hydrogen-to-metal atom ratio ≈1.5) for the i-phase and amorphous powders, suggesting structural similarities between the i-phase and the amorphous phase. Pressure-composition isotherms (PCTs), measured under low-pressure hydrogenation at a temperature of 423 K, showed sloping plateau-like features at equilibrium hydrogen pressures lower than 1 kPa for both the i-phase and amorphous powders. The plateau-like region for the i-phase powder was steeper and narrower than that for the amorphous powder, indicating a slight difference in site energy distribution of hydrogen in the i-phase and the amorphous phase.

AB - Mechanical alloying of a Ti45Zr38Ni17 powder mixture formed an amorphous phase, but subsequent annealing caused the formation of an icosahedral (i) quasicrystal phase with a small amount of the Ti2Ni-type crystal phase. After high-pressure hydrogenation at 573 K at a hydrogen pressure of 3.8 MPa, the amorphous phase transformed to a TiH 2-type hydride, while the i-phase was structurally stable even after the hydrogenation. The maximum hydrogen concentration for the high-pressure hydrogenation was the same (hydrogen-to-metal atom ratio ≈1.5) for the i-phase and amorphous powders, suggesting structural similarities between the i-phase and the amorphous phase. Pressure-composition isotherms (PCTs), measured under low-pressure hydrogenation at a temperature of 423 K, showed sloping plateau-like features at equilibrium hydrogen pressures lower than 1 kPa for both the i-phase and amorphous powders. The plateau-like region for the i-phase powder was steeper and narrower than that for the amorphous powder, indicating a slight difference in site energy distribution of hydrogen in the i-phase and the amorphous phase.

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