A First Result of Isothermal Annealing of an Fe-SiO Smoke

Details A First Result of Isothermal Annealing of an Fe-SiO Smoke A First Result of Isothermal Annealing of an Fe-SiO Smoke

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..647k&link_type=abstract

Lunar and Planetary Science, volume 27, page 647

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Condensation: Vapor Phase, Isothermal Annealing, Microscopy: Analytical Electron, Silicate Dust Analogs, Solar Nebula

Scientific paper

Laboratory studies of thermally annealed smokes will advance the understanding of silicate dust evolution in O-rich protostellar environments. Previous condensation experiments on (Mg,Fe)-SiO vapors yielded amorphous solids of approximately olivine and pyroxene compositions. Condensation in refractory AlSiO, Fe-Al-SiO, and Fe-SiO vapors similarily produced amorphous solids but with cation proportions fixed at discrete values of existing Al, Fe-silicates. Thermal annealing of an MgSiO smoke at 1000 K for up to 30 hrs. showed increased crystallinity and coarsening of forsterite and tridymite grains prior to the formation of thermodynamically stable enstatite. In a related isothermal annealing study of an Fe-bearing MgSiO smoke, fayalite and ferrosilite formed at 1000 K from thier Mg-counterparts. After 167 hrs., this study documented partial evaporation of the smoke and recondensation of a metallic-Mg vapor. These studies showed that thermal metamorphism of smokes produced metastable high-temperature end members of the appropriate solid solution. This study represents the first data from a thermally annealed FeSiO condensate at 1000 K for 4 hrs. first studied in 1991.

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