Paper Title:
Hydrogen Diffusivity and Permeability In Pd50-xTi50(Cr, Fe)x Alloys
  Abstract

Hydrogen diffusivity (D) and permeability (q) in Pd50-xTi50(Cr, Fe)x alloys were measured at temperature range between 570 and 770 K. During a heating measurement of Pd47Ti50Cr3 alloy, both D and q abruptly increased by factors of 5 and 2, respectively, at 712 K, with a phase transformation from B19 to B2 structures. However, q was far smaller than those in pure bcc metals (eg. V, Nb and Ta), where the hydrogen atoms occupy the tetrahedral interstitial sites. A first-principles calculation revealed that hydrogen atoms occupy the octahedral interstitial sites in Pd50Ti50 with B2 structure. It is concluded that the small hydrogen diffusivity in B2 Pd50-xTi50(Cr, Fe)x alloys is due to the long distance hydrogen jump and the resultant high activation energy for the diffusion.

  Info
Periodical
Materials Science Forum (Volumes 561-565)
Main Theme
Edited by
Young Won Chang, Nack J. Kim and Chong Soo Lee
Pages
2353-2356
DOI
10.4028/www.scientific.net/MSF.561-565.2353
Citation
O. Yoshinari, D. Itoh, "Hydrogen Diffusivity and Permeability In Pd50-xTi50(Cr, Fe)x Alloys", Materials Science Forum, Vols. 561-565, pp. 2353-2356, 2007
Online since
October 2007
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Price
$32.00
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