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°C, the Dy3+ cations enter the crystal lattice of CeO2 and substitute sites of Ce4+ cations in the range between 1300°C and 1400°C which resulted in the formation of Dy2O3-CeO2 solid solution. The Dy2O3-CeO2 solid solution transformed gradually into Dy2Ce2O7 after 1400°C and pure Dy2Ce2O7 can be obtained at 1500°C. No other intermediate phases were found in the whole process.
Wei Pan and Jianghong Gong
H. S. Zhang et al., "Forming Mechanism of Dy2Ce2O7 Ceramic for Thermal Barrier Coatings", Advanced Materials Research, Vols. 105-106, pp. 383-385, 2010