The mechanisms underpinning high energy storage density in lead-free Ag_1–3xNd_xTa_yNb_1-yO₃ antiferroelectric (AFE) ceramics have been investigated. Rietveld refinements of in-situ synchrotron X-ray data reveal that the structure remains quadrupled and orthorhombic under electric field (E) but adopts a non-centrosymmetric space group, Pmc2₁, in which the cations exhibit a ferrielectric configuration. Nd and Ta doping both stabilize the AFE structure, thereby increasing the AFE-ferrielectric switching field from 150 to 350 kV cm⁻¹. Domain size and correlation length of AFE/ferrielectric coupling reduce with Nd doping, leading to slimmer hysteresis loops. The maximum polarization (P_max) is optimized through A-site aliovalent doping which also decreases electrical conductivity, permitting the application of a larger E. These effects combine to enhance energy storage density to give W_rec = 6.5 J cm⁻³ for Ag_0.97Nd_0.01Ta_0.20Nb_0.80O₃.

研究了无铅Ag _{1-3 x} Nd _x Ta _y Nb _{1- y} O ₃反铁电（AFE）陶瓷中高能量存储密度的机理。Rietveld对原位同步加速器X射线数据的改进表明，该结构在电场（E）下保持四重且正交，但采用非中心对称的空间基团Pmc2 ₁，其中阳离子表现出亚铁结构。Nd和Ta掺杂均稳定AFE结构，从而将AFE铁电开关场从150 kV cm ^-1增加到350 kV cm ^-1。AFE /铁电耦合的畴尺寸和相关长度随Nd掺杂而减小，从而导致更窄的磁滞回线。最大偏振（P_最大）通过A位掺杂异价这也降低导电性，从而允许更大的应用进行优化ë。这些效果结合起来以提高能量存储密度，从而对于Ag _0.97 Nd _0.01 Ta _0.20 Nb _0.80 O ₃给出W _rec = 6.5 J cm ^-3。