The Thermodynamics of the Magnesium Silicate/Magnesium-Silicon-Oxygen Vapor System

摘要

The thermodynamic properties of magnesium silicate were investigated over a range of temperatures up to 6000K and pressures up to 1000 atmospheres. Three sets of equilibrium composition equations were used--one representing a pure gas phase, the second a heterogeneous system of gas and condensed magnesia, and the third a heterogeneous system of gas and condensed magnesia and silica. Tabulated summaries give computed values of volume, molecular weight, moles of gas, moles of solid or liquid magnesia and silica, density, enthalpy, energy, and entropy for magnesium silicate at various temperatures and pressures. A conventional Mollier diagram is included in which specific enthalpy is plotted against specific entropy, with cross plots of temperature, pressure, and molecular weight or moles of condensed magnesia and silica. The variation of sublimation temperature with pressure is also shown for magnesia and silica both alone and in the presence of each other. (Author)