Other
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979gecoa..43..547a&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 43, Apr. 1979, p. 547-553.
Other
2
Bismuth, Chondrites, Indium, Kinetics, Thallium, Vaporizing, Activation Energy, Grain Boundaries, Meteoritic Composition, Solid Solutions, Surface Diffusion, Temperature Effects, Chondrites, Kinetics, Diffusion, Energy, Metals, Condensation, Bismuth, Volatile Elements, Allende Meteorite, C3 Chondrites, Temperatures, Solar Wind, Sulfides, Desorption, Concentrations, Substrates, Heating, Decomposition, Thermodynamics
Scientific paper
Data by Lipschutz and coworkers (1975, 1976, 1977) on thermal release of Tl, Bi, and In from primitive chondrites are reexamined to obtain information on the nature and activation energy (E) of release processes: desorption, volume diffusion, and decomposition of the host phase. For the Allende C3 chondrite, the main release for Bi and Tl between 400 and 700 C is shown to be apparently due to desorption of a surface layer, coupled with grain boundary diffusion as the slow step. Further, the main release of In above 600 C and the small tails of Bi and Tl between 700 and 1000 C are observed to represent probably volume diffusion. Results for Abee and other primitive meteorites were found to be essentially similar, except for a very abrupt 500 C release of Tl from Krymka (81%) and Bi from Tieschitz (70%). It is suggested that this release may represent decomposition of a thermolabile phase in a late condensate, such as organic matter or phyllosilicates.
Alaerts Leo
Anders Edward
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