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The characteristic transition from ferroelectric (FE) to ergodic relaxor (ER) state in (Bi 0.5 Na 0.5 )TiO 3  (BNT) based lead-free ceramics provides an efficient approach to bring a highly ordered phase back to a disordered one. It would be rational to utilize this transition to improve relevant non-piezoelectric properties based on domain decomposition. In this work, different La contents were introduced to 0.93(Bi 0.5 Na 0.5 )TiO 3 -0.07Ba(Ti 0.945 Zr 0.055 )O 3  ceramics (BNT-BZT- x La) to induce evolution of ergodic degree. The results reveal that with increasing La content, both the FE-ER transition temperature  T  F-R  and depolarization temperature  T  d  shift towards room temperature, implying a deepened ergodic degree. By modulation of ergodic degree, thermally stimulated depolarization current experiment shows a higher current density peak, and corresponding pyroelectric coefficient increases from 2.46 to 2.81 μC/(cm 2 ∙°C) at  T  d . For refrigeration, the indirect measurement demonstrates the Δ T  maximum increases from 1.1 K to 1.4 K, indicating an enhanced electrocaloric effect. Moreover, the optimized energy storage effect is observed after La doping. With appearance of “slimmer”  P - E  loops, both calculated recoverable energy storage density  W  rec  and storage efficiency  η  increase to 0.23 J/cm 3  and 22.8%, respectively. These results denote La doping conduces to the improvement of non-piezoelectric properties of BNT-based ceramics in a certain range. Therefore, La doping should be an adopted modification strategy for lead-free ceramics used in areas like refrigerator and pulse capacitors.

materials

Improved Non-Piezoelectric Electric Properties Based on La Modulated Ferroelectric-Ergodic Relaxor Transition in (Bi0.5Na0.5)TiO3-Ba(Ti, Zr)O3 Ceramics