Assessment of Data on Some Oxides and Silicates: Calorimetry and Low-Pressure Phase Equilibrium Experiments

Abstract

Recently, through experimental study, much data have accumulated on the stability of oxides and silicates. In this chapter, an internally consistent thermodynamic data base on some oxides and silicates is presented which can be used to calculate phase equilibrium relations which are consistent with most of the well reversed phase equilibrium experiments. The techniques used in data assessment are discussed in Chapter 3. Details of the assessed data for each phase are given below. For some oxides, the thermodynamic data are directly adopted from calorimetric sources. These are taken as standards for assessing properties of other phases for which there is an inconsistency between thermochemical data and phase equilibrium experiments. The data on gases, steam, CO₂, CH₄, CO, H₂ and 0₂ and on the oxides CaO, FeO (stoichiometric), MgO and Al₂O₃ are from Robie et al. (1978).