NaNbO₃-based ceramics usually show ferroelectric-like P-E loops at room temperature due to the irreversible transformation of the antiferroelectric orthorhombic phase to ferroelectric orthorhombic phase, which is not conducive to energy storage applications. Our previous work found that incorporating CaHfO₃ into NaNbO₃ can stabilize its antiferroelectric phase by reducing the tolerance factor (t), as indicated by the appearance of characteristic double P-E loops. Furthermore, a small amount of MnO₂ addition effectively regulate the phase structure and tolerance factor of 0.94NaNbO₃-0.06CaHfO₃ (0.94NN-0.06CH), which can further improve the stability of antiferroelectricity. The XRD and XPS results reveal that the Mn ions preferentially replace A-sites and then B-sites as increasing MnO₂. The antiferroelectric orthorhombic phase first increases and then decreases, while the t shows the reversed trend, thus an enhanced antiferroelectricity and the energy storage density W_rec of 1.69 J/cm³ at 240 kV/cm are obtained for 0.94NN-0.06CH-0.5%MnO₂(in mass fraction). With the increase of Mn content to 1.0 % from 0.5 %, the efficiency increases to 81 % from 45 %, although the energy storage density decreases to 1.31 J/cm³ due to both increased tolerance factor and non-polar phase.

NaNbO ₃基陶瓷由于反铁电正交相向铁电正交相的不可逆转变，通常在室温下显示出类铁电PE环，不利于储能应用。我们之前的工作发现，将 CaHfO ₃掺入 NaNbO ₃可以通过降低容差因子 ( t ) 来稳定其反铁电相，如特征双PE环的出现所示。此外，少量的MnO _{2的添加有效地调节了0.94NaNbO 3} -0.06CaHfO ₃的相结构和容差因子。(0.94NN-0.06CH)，可进一步提高反铁电稳定性。_{XRD 和XPS 结果表明，随着MnO 2}的增加，Mn 离子优先取代A 位，然后是B 位。反铁电正交晶相先增大后减小，而t呈相反趋势，因此0.94NN-0.06CH-0.5在240 kV/cm下反铁电性和储能密度W _rec为1.69 J/cm ³ ，为1.69 J/cm 3 。 %MnO ₂ (以质量分数计)。随着 Mn 含量从 0.5 % 增加到 1.0 %，效率从 45 % 增加到 81 %，尽管储能密度降低到 1.31 J/cm ³由于增加的容差因子和非极性相位。