High-Entropy Materials Design: A₆B₂O₁₇-form Oxides

High-entropy materials offer expanded opportunities for accessing unique and tunable property spaces via substantial structural disorder and compositional diversity. Exploring high-entropy single-phase stabilization in novel structural systems is essential for understanding structure-property relationships in these complex systems and promoting future materials design. Here, we probe the structure and thermodynamic stability of disordered A₆B₂O₁₇-form (A = Zr, Hf; B = Nb, Ta) oxides. Specifically, we report the synthesis of the novel multicomponent oxide (Zr₃Hf₃)(NbTa)O₁₇, which is structurally isomorphous with ternary and quaternary A₆B₂O₁₇ end members. This is accomplished through a bulk ceramic processing and sintering approach. Additionally, we employ high-temperature X-ray diffraction to study the single-phase transition <i>in situ</i>. We also report on bulk dielectric permittivity measurements on these A₆B₂O₁₇ species.