Preparation and Thermal Conductivity of Y2Ce2O7 Ceramic Material

Y2Ce3O7 ceramic material was prepared by solid reaction at 1600 degrees C for 10h. The phase composition, microstructure and thermal conductivity of this material were investigated. XRD results reveals that single phase Y2Ce3O7 with fluorite structure was synthesized. Microstructure of Y2Ce3O7 was dense and no other unreacted oxides or interphase existed in the interfaces between grains. Because of phonon scattering by oxygen vacancies and difference in atomic mass between substitutional atoms and host atoms, thermal conductivty of Y2Ce3O7 is lower than that of 8YSZ, which implies that this ceramic can be used as novel candidate materials for thermal barrier coatings in the future.