Model-independent measurements of hydrogen diffusivity in the yttrium dihydrides

Majer, Günter; Gottwald, J.; Peterson, D. T.; Barnes, R. G.

doi:10.1016/S0925-8388(01)01452-9

Item

ITEM ACTIONSEXPORT

Add to Basket

Local TagsRelease HistoryDetailsSummary

Released

Journal Article

Model-independent measurements of hydrogen diffusivity in the yttrium dihydrides

MPS-Authors

/persons/resource/persons75813

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

External Resource

http://www.sciencedirect.com/science/article/pii/S0925838801014529/pdfft?md5=e5ad648bc2a0ec38951b27fa52d4b160&pid=1-s2.0-S0925838801014529-main.pdf
(Any fulltext)

http://dx.doi.org/10.1016/S0925-8388(01)01452-9
(Any fulltext)

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

Fulltext (public)

There are no public fulltexts stored in PuRe

Supplementary Material (public)

There is no public supplementary material available

Citation

Majer, G., Gottwald, J., Peterson, D. T., & Barnes, R. G. (2002). Model-independent measurements of hydrogen diffusivity in the yttrium dihydrides. Journal of Alloys and Compounds, 330-332(330-332), 438-442. doi:10.1016/S0925-8388(01)01452-9.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0010-3238-B

Abstract

The hydrogen diffusivities D in yttrium dihydrides YHx have been measured by means of pulsed-field-gradient nuclear magnetic resonance (PFG-NMR) up to 920 K for x=1.91 and up to 620 K for x=1.95 and 2.03. The observed D values are generally significantly greater than those in the dihydrides of titanium and zirconium. The activation enthalpy Ha, obtained by fitting an Arrhenius expression to the diffusivities, decreases substantially with increasing x from Ha=0.53 eV (x=1.91) to Ha=0.38 eV (x=2.03). Measurements of the proton spin-lattice relaxation Γ1 have been performed on the same samples. The temperature and concentration dependences of the dipolar relaxation Γ1d are consistent with the PFG results. Besides Γ1d and the electronic relaxation Γ1e, the Γ1 data reveal contributions due to very small concentrations of paramagnetic impurities Γ1p, which dominate the measured rates below about 500 K, even at impurity levels as low as 20 ppm or less.