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Laboratory Annealing Experiments Of Refractory Silicate Grain Analogs Using Differential Scanning CalorimetryExothermic reactions during the annealing of laboratory synthesized amorphous magnesium-bearing silicate particles used as grain analogs of cosmic dust were detected by differential scanning calorimetry (DSC) in air. With infrared spectroscopy and transmission electron microscopy, we show that cosmic dust could possibly undergo fusion to larger particles, with oxidation of magnesium silicide and crystallization of forsterite as exothermic reactions in the early solar system. The reactions begin at approximately 425, approximately 625, and approximately 1000 K, respectively, and the reaction energies (enthalpies) are at least 727, 4151, and 160.22 J per gram, respectively. During the crystallization of forsterite particles, the spectral evolution of the 10 micrometer feature from amorphous to crystalline was observed to begin at lower temperature than the crystallization temperature of 1003 K. During spectral evolution at lower temperature, nucleation and/or the formation of nanocrystallites of forsterite at the surface of the grain analogs was observed.
Document ID
20120012576
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Kimura, Yuki
(Tohoku Univ. Sendai, Japan)
Nuth, Joseph A., III
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Tsukamota, Katsuo
(Tohoku Univ. Sendai, Japan)
Kaito, Chihiro
(Ritsumeikan Univ. Shiga, Japan)
Date Acquired
August 26, 2013
Publication Date
September 17, 2010
Publication Information
Publication: Meteoritics and Planetary Science
Volume: 46
Issue: 1
Subject Category
Chemistry And Materials (General)
Report/Patent Number
GSFC.JA.01262.2012
Funding Number(s)
CONTRACT_GRANT: KAKENHI 19840048
Distribution Limits
Public
Copyright
Other

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