The Thermodynamics of the Beryllia/Beryllium-Oxygen Vapor System

by Firmin Joseph Krieger

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A study of beryllia (Be0) as an ablative material for possible use in reentry bodies. The gas formed by heating beryllia to a temperature of 6000 K at pressures up to 10 atmospheres was assumed to comprise 15 beryllium-oxygen species. Two sets of equilibrium equations were used, one for computing results with the pure gas and the other for smoke or fog form with condensed solid or liquid Be0 dispersed. Tables summarize the computed values of volume, molecular weight, moles of gas and of condensate, density, enthalpy, energy, and entropy at various temperatures and pressures. Graphical representations include the conventional Mollier diagram, curves whose intersection shows the vanishing point of the condensate, and the variation of sublimation temperature with pressure for beryllia compared with graphite, magnesia, and silica.

This report is part of the RAND Corporation Research memorandum series. The Research Memorandum was a product of the RAND Corporation from 1948 to 1973 that represented working papers meant to report current results of RAND research to appropriate audiences.

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