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Journal Article

Pulsed-field-gradient NMR study of hydrogen diffusivity in random b.c.c. alloys VyTa1-y


Majer,  Günter
Cellular Biophysics, Max Planck Institute for Medical Research, Max Planck Society;

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Grinberg, F., Majer, G., & Skripov, A. N. (2006). Pulsed-field-gradient NMR study of hydrogen diffusivity in random b.c.c. alloys VyTa1-y. Journal of Alloys and Compounds, 425(1-2), 24-27. doi:10.1016/j.jallcom.2006.01.065.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0010-4515-B
Hydrogen diffusion coefficients D in disordered b.c.c. systems VyTa1−yH0.07 (y = 0.25, 0.50 and 0.75) have been measured by means of the pulsed-field-gradient nuclear magnetic resonance over the temperature range 190–435 K. The hydrogen diffusivities are found to depend strongly on the alloy composition, the room-temperature value of D in the sample with y = 0.75 being an order of magnitude higher than those in the samples with y = 0.25 and 0.50. For all the samples studied, the temperature dependences of H diffusivity follow the Arrhenius law with the activation energies of 0.186 eV (y = 0.25, 306–410 K), 0.182 eV (y = 0.50, 295–401 K) and 0.102 eV (y = 0.75, 190–435 K). These values are in reasonable agreement with those obtained from the proton spin-lattice relaxation measurements reported earlier. The jump lengths of H atoms have been estimated by comparing the measured H diffusivities with the proton spin-lattice relaxation data.