TETRAGONAL-MONOCLINIC PHASE-TRANSITION ENTHALPY AND TEMPERATURE OF ZRO2-CEO2 SOLID-SOLUTIONS

DSC (differential scanning calorimeter) measurements were performed to investigate the tetragonal-monoclinic (t-m) transition enthalpy of th e compositionally homoge neous ZrO2-X mol% CeO2 solid solution of X = 0, 4, 8, and 12. The transition enthalpy decreases linearly with an in crease of CeO2 content. The m --> t transition enthalpy on heating agr eed well with the inverse t --> in one obtained during cooling. With i ncreasing X, the DSC peak broadens and the transition temperature dist ribution of each sample increases, while the thermal hysteresis is alm ost independent of X.