ATOMIC TRANSPORT PROPERTIES OF INTERMETALLIC COMPOUNDS beta -LiAl AND beta -LiIn.

S. C. Chen*, John C. Tarczon, W. P. Halperin, J. O. Brittain

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The Li mass transport mechanisms of the NaTl-type intermetallic compounds beta -LiAl and beta -LiIn were studied using the Pulsed Field Gradient (PFG) NMR spin echo technique over a temperature range of 297-485 K. The lithium self-diffusion coefficients in beta -LiAl alloys follow Arrhenius behavior. The Li diffusion coefficients and the associated diffusion constant D//o(Li) and activation energy LT AN BR E RT AN BR decrease with increasing Li content. A vacancy diffusion mechanism based on two mean jump times for vacancies yields a quantitative description of the Li diffusion process under a V//L//i-Li//A//l attractive interaction. High values of Li diffusivities (10** minus **6cm**2/sec at room temperature) which increase with decreasing Li content were observed in beta -LiIn alloys. Over the temperature range 300-400 K, the Li diffusion coefficient obeys the Arrhenius relation. The diffusion constant D//o(Li) and activation energy LT AN BR E RT AN BR decrease with increasing Li content. The results suggest that there is a repulsive interaction between the vacancy (V//L//i) and the antistructure atom (Li//I//n). Theoretical analysis indicate that this V//L//i-Li//I//n repulsive interaction is so strong that it goes into the second nearest neighbor distance.

Original languageEnglish (US)
Title of host publicationProceedings of the Riso International Symposium on Metallurgy and Materials Science
PublisherRiso Natl Lab
Pages213-220
Number of pages8
ISBN (Print)8755011373
StatePublished - Dec 1 1985

Publication series

NameProceedings of the Riso International Symposium on Metallurgy and Materials Science
ISSN (Print)0108-8599

ASJC Scopus subject areas

  • Engineering(all)

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