Self-diffusion coefficient of hydrogen in NbH$sub 0$ $sub 6$

Journal Article · Tue Apr 01 04:00:00 EDT 1975 · Phys. Rev., B, v. 11, no. 7, pp. 2443-2446

OSTI ID:4142227

Zogal, O J; Cotts, R M

Direct measurements of the self-diffusion coefficient D of hydrogen in a hydrided single crystal of niobium were made between 90 and 243$sup 0$C using the NMR pulsed-field-gradient technique. For Nb$sub 0$$.$$sub 6$ in the $alpha$' phase, D = D$sub 0$ exp (-E/sub alpha//kT), where D$sub 0$ = 6.6 x 10$sup -4$ cm$sup 2$/sec and E/sub alpha/ = 0.165 +- 0.008 eV/atom. By combining measurements of D and the spin-lattice relaxation rate for hydrogen, it is found that the rms jump distance [l$sup 2$]/sup $sup 1$$/$$sub 2$/ has a value within the range 0.5b less than or equal to [l$sup 2$]/sup $sup 1$$/$$sub 2$/ less than or equal to 0.8b, where b is the bcc lattice constant. Measurements of D are compared with published results for other hydrogen concentrations as obtained from quasielastic neutron scattering and Gorsky-effect experiments. (auth)

• Research Organization: Cornell Univ., Ithaca, NY
• NSA Number: NSA-33-012569
• OSTI ID: 4142227
• Journal Information: Phys. Rev., B, v. 11, no. 7, pp. 2443-2446, Journal Name: Phys. Rev., B, v. 11, no. 7, pp. 2443-2446; ISSN PLRBA
• Country of Publication: United States
• Language: English

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