High‐entropy strategies boosting dielectric temperature stability in (Na 0.4 K 0.1 Bi 0.5 )TiO 3 ceramics

Abstract Utilizing a high‐entropy strategy, we propose a novel approach for synthesizing (Na 0.4 K 0.1 Bi 0.5 )TiO 3 (NKBT)‐based ceramics endowed with exceptional dielectric stability at elevated temperatures. The high‐entropy effect induces a random tilt in the oxygen octahedra of NKBT ceramics, leading to a broad dielectric response characterized by diffuse phase transitions. By weakening the dielectric abnormal peak at T s of BNT, the dielectric stability of high‐entropy NKBT ceramics is significantly enhanced. Notably, at 100 kHz, the temperature stability range of (Na 0.4 K 0.1 Bi 0.5 )(Ti 0.65 Zr 0.1 Sn 0.15 Hf 0.1 )O 3 , synthesized through the traditional solid reaction method, reaches an impressive 311°C, surpassing undoped NKBT by 257%. This significant enhancement underscores the feasibility of our high‐entropy strategy in improving dielectric performance. Our work demonstrates a straightforward and cost‐effective method for significantly improving the dielectric temperature stability of NKBT ceramics.