Hydrogen diffusion in NaH as derived from isotope exchange experiments

TitleHydrogen diffusion in NaH as derived from isotope exchange experiments
Publication TypeJournal Article
Year of Publication2009
AuthorsBorgschulte A, Pendolino F, Gremaud R, Zuttel A
JournalApplied Physics Letters
Date PublishedMar 16
ISBN Number0003-6951
Accession Numberhttp://apps.isiknowledge.com/InboundService.do?Func=Frame&product=WOS&action=retrieve&SrcApp=EndNote&Init=Yes&SrcAuth=ResearchSoft&mode=FullRecord&UT=000264380300023
Keywordsdifferential thermal analysis, hydride, hydrogen, isotope exchanges, self-diffusion, sodium compounds, thermal analysis, vacancies (crystal)

We report on hydrogen-deuterium-exchange experiments on NaH probed by thermogravimetry. From the measurements a diffusion parameter of deuterium in NaH of D=1.1x10(-17) m(2)/s at 523 K is derived. The activation energy of tracer diffusion of D in NaH is found to be 1.0 eV. The results are hints for a diffusion process mediated by neutral hydrogen vacancies.