Journal
ASTRONOMY & ASTROPHYSICS
Volume 436, Issue 1, Pages 165-169Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20042374
Keywords
astrochemistry; method : laboratory; stars : AGB and post-AGB; stars : circumstellar matter; ISM : dust, extinction
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The crystallization of amorphous Mg-bearing silicate grains into Mg2SiO4 and its temperature dependence were clarified by observing the grains in situ while heating in a transmission electron microscope. The crystallization started from the grain surface at 800 degrees C. Before the crystallization at the grain surface, the formation of a rim-like layer due to prenucleation was observed. The characteristic structure change of the grains was recorded and indicated that prenucleation occurred before crystallization. This phenomenon probably corresponds to the stall idea suggested by Hallenbeck & Nuth ( 1998, Ap& SS, 255, 427) in the crystallization of silicate.
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