Superior ferroelectric properties and enhanced depolarization temperature simultaneously achieved in BNT‐based ceramics

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Bi 0.5 Na 0.5 TiO 3 ‐based ceramics with high remnant polarization P r have shown outstanding potential in the application of high‐power ferroelectric transducers. However, low depolarization temperature T d is an obstacle for their application. Here, a composition design strategy was proposed to simultaneously improve the T d and P r in BNT‐based materials. Ultrahigh P r of 40.56 µC/cm 2 and relative high T d of 184°C were synergistically achieved in (Bi 0.5 Na 0.5 )(Ti 0.995 Mn 0.005 )O 3 (BNMT) ceramics by adding 1.0 mol% BiGaO 3 (BG), which is superior to other reported lead‐free systems. The excellent ferroelectric properties were attributed to strengthen ferroelectric order as evidenced by increased rhombohedral distortion. Meanwhile, the enhanced depolarization temperature, increasing from 168°C for x = 0% to 184°C for x = 1.0%, can be ascribed to the suppression of the thermal‐induced ferroelectric‐relaxor phase transition by adding BG. Those results enable the BNMT‐BG systems ceramics to be an attractive candidate for application in high‐power supplies.