Physics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56..511h&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 56, Jan. 1992, p. 511-532.
Physics
8
Aluminum Compounds, Calcium Compounds, Hydroxides, Planetary Composition, Silicon Compounds, Solar System Evolution, Volatility, Water Vapor, Entropy, Heat Of Formation, Iron, Magnesium, Meteoritic Composition, Solar Corona, Thermodynamic Properties, Transpiration, Vapor Phases, Vapor Pressure
Scientific paper
The vapor pressures of Ca(OH)2(g), Al(OH)3(g), and Si(OH)4(g) molecules in equilibrium with solid calcium-, aluminum, and silicon-oxides, respectively, were determined, and were used to derive the heats of formation and entropies of these species, which are expected to be abundant under the currently postulated physical conditions in the primordial solar nebula. These data, in conjunction with thermodynamic data from literature, were used to calculate the relative abundances of M, MO(x), and M(OH)n gas species and relative volatilities of Fe, Mg, Si, Ca, and Al for ranges of temperature, total pressure, and H/O abundance ratio corresponding to the plausible ranges of physical conditions in the solar nebula. The results are used to explain how Ca and Al could have evaporated from Ca,Al-rich inclusions in carbonaceous chondrites, while Si, Mg, and Fe condensed onto them during the preaccretion alteration of CAIs.
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