The Thermodynamics of the Silica/Silicon-Oxygen Vapor System

by Firmin Joseph Krieger

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A thermodynamic investigation of silica, Si0, over a range of temperatures up to 6000 deg K and pressures up to 10,000 atmospheres. The study, the seventh of a series of analyses of ablative materials, employs two sets of equilibrium composition equations, 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 seven gaseous silicon-oxygen species. Results of the computational program are presented in tabular and graphic form, the latter being 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. (See also RM-3326-3, RM-3708, RM-3709, RM-3988, RM-4404, RM-4634.)

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