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This study discovers a reversible order-disorder transition (ODT) in a10-cation compositionally complex ceramic,(Nd0.15Pr0.15Dy0.8Ho0.8Er0.8Ti0.2Yb0.1Hf0.1Zr0.1Nb0.8)O7-delta, induced viaannealing in oxidized vs. reduced environments at 1600C. Notably, the 10-cationoxide remains a homogenous single-phase high-entropy solid solution before andafter the ODT in the pyrochlore vs. fluorite structure that can be quenched.In-situ neutron diffraction reveals the oxygen vacancy formation and atomicdisplacement during this ODT. The temperature dependence of thermalconductivity is altered by the ODT. This study reveals a new pathway to induceODT via a redox transition to tailor the properties of compositionally complexfluorite-based oxides.

Discovery of a reversible redox-induced order-disorder transition in a 10-cation compositionally complex ceramic