2000 Volume 68 Issue 6 Pages 451-454
Nonstoichiometry of fluorite-type oxide solid solutions Zr0.164Ce0.654Y0.182O1.91-δ was measured as a function of temperature (T = 973-1273 K) and oxygen partial pressure (P(O2) = 10−2-10−24 atm) using thermogravimetry. The experimental date was well reproduced by the regular solution model. From the δ-logP(O2)-T relationship, the partial molar enthalpy 
and the partial molar entropy 
of oxygen in Zr0.164Ce0.654Y0.l82O1.91-δ were also determined as a function of δ. The agrees well with theoretical calculation using the random configuration. The δ dependence of can be attributed to origin of the deviation from ideal solution behavior of this system.
