Effect of substitutional Cr on hydrogen diffusion and thermal stability for the BCT monohydride phase of the V-H system studied by 1H NMR

Kohta Asano, Shigenobu Hayashi, Yumiko Nakamura, Etsuo Akiba

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The diffusion of hydrogen in the monohydride phase (β phase) of the V 1-xCr x-H (x ≤ 0.1) system was studied by means of 1H nuclear magnetic resonance (NMR). Hydrogen atoms in the hydrides occupied the octahedral (O) sites in a body centered tetragonal (BCT) structure. The BCT lattice was contracted by addition of Cr because Cr has a smaller atomic radius than V. The activation energy for hydrogen diffusion, E H, and the Korringa constant, T 1eT, were estimated from the temperature and frequency dependence of 1H spin-lattice relaxation times, T 1. The value of E H increased with increase in the Cr content. The contraction of the BCT lattice by addition of Cr suppressed the diffusion of hydrogen which occupied the interstitial sites. Addition of Cr also increased the T 1eT, which was accompanied by reducing in the stability of the monohydride phase of the V-H system.

Original languageEnglish
Pages (from-to)63-68
Number of pages6
JournalJournal of Alloys and Compounds
Volume524
DOIs
Publication statusPublished - May 25 2012

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Hydrogen
Thermodynamic stability
Nuclear magnetic resonance
Spin-lattice relaxation
Theophylline
Hydrides
Relaxation time
Activation energy
Atoms
Temperature

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Effect of substitutional Cr on hydrogen diffusion and thermal stability for the BCT monohydride phase of the V-H system studied by 1H NMR. / Asano, Kohta; Hayashi, Shigenobu; Nakamura, Yumiko; Akiba, Etsuo.

In: Journal of Alloys and Compounds, Vol. 524, 25.05.2012, p. 63-68.

Research output: Contribution to journalArticle

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AU - Akiba, Etsuo

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N2 - The diffusion of hydrogen in the monohydride phase (β phase) of the V 1-xCr x-H (x ≤ 0.1) system was studied by means of 1H nuclear magnetic resonance (NMR). Hydrogen atoms in the hydrides occupied the octahedral (O) sites in a body centered tetragonal (BCT) structure. The BCT lattice was contracted by addition of Cr because Cr has a smaller atomic radius than V. The activation energy for hydrogen diffusion, E H, and the Korringa constant, T 1eT, were estimated from the temperature and frequency dependence of 1H spin-lattice relaxation times, T 1. The value of E H increased with increase in the Cr content. The contraction of the BCT lattice by addition of Cr suppressed the diffusion of hydrogen which occupied the interstitial sites. Addition of Cr also increased the T 1eT, which was accompanied by reducing in the stability of the monohydride phase of the V-H system.

AB - The diffusion of hydrogen in the monohydride phase (β phase) of the V 1-xCr x-H (x ≤ 0.1) system was studied by means of 1H nuclear magnetic resonance (NMR). Hydrogen atoms in the hydrides occupied the octahedral (O) sites in a body centered tetragonal (BCT) structure. The BCT lattice was contracted by addition of Cr because Cr has a smaller atomic radius than V. The activation energy for hydrogen diffusion, E H, and the Korringa constant, T 1eT, were estimated from the temperature and frequency dependence of 1H spin-lattice relaxation times, T 1. The value of E H increased with increase in the Cr content. The contraction of the BCT lattice by addition of Cr suppressed the diffusion of hydrogen which occupied the interstitial sites. Addition of Cr also increased the T 1eT, which was accompanied by reducing in the stability of the monohydride phase of the V-H system.

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