Agglomeration of hydrogen-induced vacancies in nickel

Osono, Hiroto; Kino, Takao; Kurokawa, Y.; Fukai, Yuh

doi:10.1016/0925-8388(95)01835-2

Cited by 48 publications

(22 citation statements)

References 3 publications

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“…7 They have also revealed, using scanning electron microscope ͑SEM͒, that in Pd and Ni large amount of nanopores with diameters of 20-200 nm are present. 8 Moreover, the vacancy ordered structure L1 2 has been observed in Pd-H by means of x-ray diffraction analysis. It has shown superstructure lines with indices such as in a cubic unit cell.…”

Section: Introductionmentioning

confidence: 97%

First-principles study of vacancy-hydrogen interaction in Pd

et al. 2009

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Hydrogen absorption in face-centered-cubic palladium is studied from first principles, with particular focus on interaction between hydrogen atoms and vacancies, formation of hydrogen-vacancy complexes, and multiple hydrogen occupancy of a Pd vacancy. Vacancy formation energy in the presence of hydrogen, hydrogen trapping energy, and vacancy formation volume have been calculated and compared to existing experimental data. We show that a vacancy and hydrogen atoms form stable complexes. Further we have studied the process of hydrogen diffusion into the Pd vacancy. We find the energetically preferable position for hydrogen to reside in the palladium unit cell in the presence of a vacancy. The possibility of the multiple hydrogen occupancy ͑up to six hydrogen atoms͒ of a monovacancy is elucidated. This theoretical finding supports experimental indication of the appearance of superabundant vacancy complexes in palladium in the presence of hydrogen.

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Section: Introductionmentioning

confidence: 97%

First-principles study of vacancy-hydrogen interaction in Pd

et al. 2009

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“…Accordingly, H blistering accumulation will change the microstructures and mechanical properties of W, which is the most important issue in developing W as a PFM. On the other hand, H has been also shown to assist vacancy formation in W as well as other metals such as Mo, Ni, Cr, Pd and Al [1][2][3]21], which will in turn further enhance the H trapping. The relevant results have been reviewed systematically by Condon [22] and Fukai [23].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the interaction of H with metals and metal-alloys is of great scientific and technological interest [1][2][3][4][5][6][7]. Especially in a fusion reactor [8] at present, metals are used as the plasma facing material (PFM) which is exposed to extremely high fluxes of H isotope [deuterium-tritium (D-T)] ions.…”

Section: Introductionmentioning

confidence: 99%

Investigating behaviors of H in a W single crystal by first-principles: From solubility to interaction with vacancy

Liu

Zhou

Zhang

2011

Journal of Alloys and Compounds

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“…The state of hydrogen in these phases was investigated by thermal desorption spectroscopy (TDS) on specimens after recovery from high p(H 2 ), T treatments. In the course of these experiments, we discovered evidence of superabundant vacancy (SAV) formation, as observed in several other metal-hydrogen alloys, [12][13][14][15][16][17][18][19][20] and investigated the SAV * Graduate Student, Chuo University.…”

Section: Introductionmentioning

confidence: 99%

Phase Diagram and Superabundant Vacancy Formation in Cr-H Alloys

Fukai

Mizutani

2002

Mater. Trans.

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X-ray diffraction measurements on the Cr-H system were made using synchrotron radiation at high hydrogen pressures and high temperatures, and the phase diagram was determined up to p(H 2 ) = 5.5 GPa and T 1400 K. Three solid phases were found to exist; a bcc phase (α) of low hydrogen concentrations, x = [H]/[Cr] 0.03 existing at low hydrogen pressures ( 4.4 GPa), and two high-pressure phases, an hcp (ε) phase at lower temperatures and an fcc (γ ) phase at higher temperatures, both having high hydrogen concentrations x ∼ 1. A drastic reduction of the melting point is caused by dissolution of hydrogen. A gradual lattice contraction observed in the fcc phase indicates the formation of superabundant Cr-atom vacancies (vacancy-hydrogen clusters). Thermal desorption measurements after recovery from high p(H 2 ), T treatments revealed several desorption stages including those due to the release from vacancy-hydrogen clusters and from hydrogen-gas bubbles, and allowed determination of relevant trapping energies.

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Agglomeration of hydrogen-induced vacancies in nickel

Cited by 48 publications

References 3 publications

First-principles study of vacancy-hydrogen interaction in Pd

First-principles study of vacancy-hydrogen interaction in Pd

Investigating behaviors of H in a W single crystal by first-principles: From solubility to interaction with vacancy

Phase Diagram and Superabundant Vacancy Formation in Cr-H Alloys

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