Thermodynamic Behavior of Various Phases Appearing in the CeZrO4 ‐ CeZrO3.5 System and the Formation of Metastable Solid Solutions

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Abstract
In order to investigate the thermodynamic behavior of t′, t*, and κ phases with the composition, , the equilibrium oxygen partial pressure, p O2, over their mixtures with pyrochlore was measured utilizing an electrochemical cell: . The conclusions described below were derived: the thermodynamic stability of the κ phase is the lowest in the system. The κ phase forms metastable solid solutions with the pyrochlore phase; it was virtually stable around 1123 K. Two kinds of tetragonal phases exist, tet. (high temp.) and tet. (low temp.), which may correspond to t ′ and t *, respectively. A change in p O2 corresponding to the phase transitions: κ → t′ and t * ⇄ was observed. The standard Gibbs energies of formation, ΔGo, of κ( ) and for the reaction: were evaluated from the emf data.

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