ABSTRACT Dislocations are unavoidable in ceramics, yet their deliberate use to sculpt polar order has never been exploited in bulk ceramics for energy‐storage. Here, curved dislocations are continuously thread from a P 4/ mmm shell into a P 4 mm core to imprint oriented polar textures in (1‐ x )Ba 0.5 Bi 0.5 Ti 0.5 Fe 0.5 O 3 ‐ x Ca 0.7 La 0.2 ZrO 3 high‐entropy ceramics. Both large A/B‐sites ionic‐radius mismatch and A‐site defect distort the core‐shell lattice, generating dense curved dislocations and abundant doubly‐charged oxygen vacancies that collectively pin a locally textured polar state. The resulting ceramic delivers a large recoverable energy‐storage density of 9.1 J cm −3 with 91.0% efficiency at 660 kV cm −1 , while retaining stable performance over 10–200 Hz, 20–140°C, and 10 5 cycles. Dislocation‐engineered local polar texturing thus offers a universal design route for next‐generation high‐performance relaxor‐ferroelectric energy‐storage ceramics.
Chen et al. (Mon,) studied this question.