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THE THERMODYNAMICS OF THE SILICA/SILICON-OXYGEN VAPOR SYSTEM,
RAND CORP SANTA MONICA CA
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The purpose of this study is the thermodynamic investigation of silica, SiO2, over a range of temperatures up to 6000 K and pressures up to 10,000 atmospheres. Two sets of equilibrium composition equations are used--one representing a pure gas phase, the other a heterogeneous system of gas and condensed i.e., solid or liquid silica. The gas phase of the heterogeneous chemical system, like the homogeneous gas phase, comprises 7 gaseous silicon-oxygen species. The results of the computational program are presented in both tabular and graphic form. The later is a conventional Mollier diagram in which specific enthalpy is plotted against specific entropy, with cross plots of temperature, pressure, and molecular weight or moles of condensed silica. Author
APPROVED FOR PUBLIC RELEASE