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Improved thermomechanical properties have been reported for varioushigh-entropy oxides containing typically five metal cations. This study furtherinvestigates a series of duodenary (11 metals + oxygen) high-entropy oxides bymixing different fractions of a five-cation fluorite-structured niobate and aseven-cation pyrochlore (both containing Yb) with matching lattice constants.Nine compositions of duodenary high-entropy oxides have been examined. All ofthem exhibit single high-entropy phases of either disordered fluorite orordered pyrochlore structure. An order-disorder transition (ODT) is evidentwith changing composition, accompanied by a reduction in thermal conductivity(k). In comparison with the ODT criteria developed from ternary oxides, theseduodenary oxides are more prone to disorder, but the ODT is still controlled bysimilar factors (but at different thresholds). Interestingly, there are abruptincreases in Young's modulus (E) at low mixing concentrations near bothendmembers. The E/k ratios are increased, in comparison with both endmembers.This study suggests a new route to tailor high-entropy ceramics via controllingcation ordering vs. disordering.

Single-Phase Duodenary High-Entropy Fluorite/Pyrochlore Oxides with an Order-Disorder Transition