Thermodynamic Calculation of the Equilibrium Temperature between the Tetragonal and Monoclinic Phases in CeO_2-ZrO_2

摘要

Gibbs free energies of tetragonal and monoclinic phases at vatious temperatures are calculated for 8, 10 and 12 mol percent CeO_2-ZrO_2 by referring to the revised CeO_2-ZrO_2 phase diagram given by Tani et at. and utilising the Lukas program. The equilibrium temperatures T0, between t and m phases are obtained as 999, 838 and 697 K for 8, 10 and 12 mol percent CeO_2-ZrO_2, respectively, being much lower than the T_0 of ZrO_2.