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Sodium niobate (NaNbO 3 )-based antiferroelectric (AFE) ceramics have received significant attention for energy storage applications because of their good performance, low cost, and nontoxicity. However, the existence of the antiferroelectric  P  phase at room temperature causes large hysteresis, resulting in reduced energy storage efficiency. In this study, 0.88NaNbO 3 –0.12Sr 0.7 Bi 0.2 TiO 3  ceramics doped with Nd 3+  (i.e., 0.88Na 1-3xNdxNbO 3 -0.12Sr 0.7 Bi 0.2 TiO 3 ) at  x  = 0.0 − 0.025 were prepared via conventional solid-state mixed oxide route. The XRD data showed that all samples exhibited an orthorhombic structure. With increasing Nd 3+  doping content, the antiferroelectric  P  ( Pbma ) phase to  R  ( Pnma ) phase transition temperature ( TP-R ) shifted to lower temperatures. Consistent with the dielectric properties, a transition to a relaxor-like slim  P-E  loop indicative of an AFE  R  phase was observed at the composition  x  ≥ 0.01. This led to an increase in both the recoverable energy-storage density ( Wrec ) and efficiency ( η ) with an increasing amount of Nd 3+  doping level. The maximum recoverable energy storage density ( Wrec  = 0.54 J/cm 3 ) and high energy storage efficiency ( η  = 93%) were observed at  x  = 0.025 under an applied electric field of 100 kV/cm. In addition, the optimum composition at  x  = 0.025 also exhibited excellent temperature stability from 25 °C to 150 °C. This research demonstrates that the NN–SBT– x Nd system has the potential for use for high-energy-density pulsed power capacitor applications.

Dielectric and Improved Energy-Storage Properties in A-Site Nd 3+ Doped Lead-Free 0.88NaNbO 3 -0.12Sr 0.7 Bi 0.2 TiO 3 Ceramics