Phys. Rev. Lett. 82, 2302–2305 (1999)Deuterium Diffusion in Niobium: The Influence of Coherency StressesReceived 5 October 1998; published in the issue dated 15 March 1999 We studied the influence of coherency stresses on deuterium diffusion in a NbD0.33 crystal by quasielastic neutron scattering, discriminating coherent from incoherent scattering by neutron spin analysis (454≤T≤504 K). The diffusion coefficient D of the deuterium interstitials, describing collective diffusion according to Fick's law, was derived from the coherent quasielastic scattering. The values of D exceed published Gorsky effect results for the same quantity by factors of up to 30. We demonstrate quantitatively that the large differences in D reflect the dissimilar influence of coherency stresses on the deuterium fluctuations respectively probed by neutron scattering and Gorsky effect. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.82.2302
DOI:
10.1103/PhysRevLett.82.2302
PACS:
61.72.Ji, 66.30.Jt
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.