Thermal metamorphism of Si2O3 - (A circumstellar dust analog)

Details Thermal metamorphism of Si2O3 - (A circumstellar dust analog) Thermal metamorphism of Si2O3 - (A circumstellar dust analog)

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984lpsc...14..657n&link_type=abstract

(American Geophysical Union and NASA, Lunar and Planetary Science Conference, 14th, Houston, TX, Mar. 14-18, 1983) Journal of Ge

Physics

2

Cosmic Dust, Metamorphism (Geology), Silicon Oxides, Stellar Envelopes, Annealing, Infrared Spectra, Quartz, Metamorphism, Thermal Effects, Silicon Oxide, Analogs, Experiments, Dust, Condensates, Quartz, Infrared, Wavelengths, Spectra, Features, Comparisons, Annealing, Decay, Structure, Grains

Scientific paper

The thermal behavior of Si2O3, the metastable condensate from SiO vapor,has been studied experimentally. Si2O3 and its successor, amorphous quartz, have previously been shown to have infrared spectral features similar to some that appear in the spectra of grains in oxygen-rich circumstellar regions. Thermal annealing experiments show that only one Si2O3 decay process operates over the range between 750-1000 K. This process is a unimolecular disproportionation. The rate of this transformation can be expressed as k/hr = 10 to the 9th exp (-40 kcal/mole/RT). By using this rate constant, it is found that a significant fraction of freshly nucleated circumstellar grains can survive passage through a typical circumstellar shell virtually unaltered in structure. It is emphasized that this is only the first in a series of laboratory experiments intended to study the metamorphism of newly condensed circumstellar material ejected into the interstellar medium. Grains similar to these might have been incorporated into the primitive solar nebula, provided that they could also survive passage through the general interstellar medium.

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