Design and preparation of high-entropy fluorite oxides based on R‾-S diagram

Since high-entropy oxide has a huge compositional space, it is urgent to develop efficient methods to quickly find the compositions that can form single-phase materials. In this paper, taking (Ce, Zr, Hf, Yb, Nb)O 2 system as an example, we carried out the design and preparation of high-entropy fluorite oxides (HEFOs) by constructing a R ‾ -S diagram. Three single-phase HEFOs have been successfully design and synthesized. The impedance measurement showed that the three materials are electronic conductors, which exhibited relatively low thermal conductivities ranging between 1.6 W/m·K ∼1.9 W/m·K. The current study suggests that R ‾ -S diagram is a useful tool for quickly selecting compositions that can form single-phase high-entropy oxides.