Computer Science
Scientific paper
Jan 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978e%26psl..37..445j&link_type=abstract
Earth and Planetary Science Letters, Volume 37, Issue 3, p. 445-450.
Computer Science
7
Scientific paper
Tracer diffusion coefficients for Li in glasses of albite, orthoclase, and obsidian composition have been determined by a method involving deposition of a thin source on polished glass wafers, anneal under controlled temperature conditions (300-900°C), and ion-microprobe determination of the concentration profile. All results conform to an Arrhenius-type relationship, D = D0 exp(-Q/RT), where Q is 23, 17, and 22 kcal mol-1 D0 is 0.2, 0.003, and 0.03 cm2s-1 for albite and orthoclase glasses, and obsidian respectively. Lithium is thus a fast diffusing ion and behaves similarly to sodium in the same glasses. A mechanism involving jumps of the diffusing ions through oxygen hexagonal rings is suggested by consideration of ionic radii ratio of alkali (H, Li, Na, K, Rb, and Cs) ions to the oxygen anions.
Jambon Albert
Semet Michel P.
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