Forming Mechanism of Dy2Ce2O7 Ceramic for Thermal Barrier Coatings

The forming mechanism of Dy2Ce2O7 prepared by solid reaction using CeO2 and Dy2O3 as reactants was analyzed by X-ray diffraction method. It is indicated that there is almost no solid solution reaction between Dy2O3 and CeO2 before 1300 degrees C, the Dy3+ cations enter the crystal lattice of CeO2 and substitute sites of Ce4+ cations in the range between 1300 degrees C and 1400 degrees C which resulted in the formation of Dy2O3-CeO2 solid solution. The Dy2O3-CeO2 solid solution transformed gradually into Dy2Ce2O7 after 1400 degrees C and pure Dy2Ce2O7 can be obtained at 1500 degrees C. No other intermediate phases were found in the whole process.