Laboratory annealing experiments of refractory silicate grain analogs using differential scanning calorimetry

Yuki Kimura, Joseph A. Nuth, Katsuo Tsukamoto, Chihiro Kaito

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Exothermic 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 1000K, respectively, and the reaction energies (enthalpies) are at least 727, 4151, and 160.22Jg-1, respectively. During the crystallization of forsterite particles, the spectral evolution of the 10μm feature from amorphous to crystalline was observed to begin at lower temperature than the crystallization temperature of 1003K. During spectral evolution at lower temperature, nucleation and/or the formation of nanocrystallites of forsterite at the surface of the grain analogs was observed.

Original languageEnglish
Pages (from-to)92-102
Number of pages11
JournalMeteoritics and Planetary Science
Volume46
Issue number1
DOIs
Publication statusPublished - 2011 Jan 1

ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science

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