CHEMICAL THERMODYNAMIC REPRESENTATION OF VERY NONSTOICHIOMETRIC PHASES - (CEO2-X)

The entire LT AN BR CeO//2// minus //x RT AN BR data base for the dependence of the nonstoichiometry, x, on temperature and chemical potential of oxygen (oxygen potential) was retrieved from the literature and represented by a thermodynamic method. The method resulted in partial molal Gibbs free energy quantities that are useful for any thermodynamic calculation involving LT AN BR CeO//2// minus //x RT AN BR . It also accurately represents, for the first time, the complex behavior of the experimental data, including the low-temperature miscibility gap. The method appears to be generally applicable to many very nonstoichiometric phases.