The (Bi_0.2Na_0.2K_0.2La_0.2Sr_0.2)(Ti_1-xSc_x)O₃ (BNKLST-xSc) high entropy ceramics (HECs) have been successfully synthesized via a citrate acid method. The effects of Sc-doping on the lattice structure, microstructural morphology, dielectric and energy-storage properties of HECs are comprehensively investigated. The results indicate that although Sc³⁺ doped at B-site does not alternate the perovskite structure of BNKLST with a single phase, it results in lattice expansion and weakened bonding in TiO₆ octahedron. The dielectric constant of BNKLST-xSc is reduced while the dielectric relaxation is enhanced with increasing Sc content x, due to the enhanced structural inhomogeneity in nano-regions. In addition, the lattice structure of BNKLST-0.2Sc exhibits ultra-high thermal stability at 30–300 °C, which achieves the maximum energy storage density of 1.094 J/cm³ with an outstanding efficiency better than 80%, accompanying by the mechanical and dielectric losses as low as ~ 10^–3. It is suggested that BNKLST-0.2Sc could be promising dielectric materials in capacitors and energy-storage devices with an excellent combination of ultrahigh power density, high energy density, thermal stability as well as low mechanical and dielectric losses.

通过柠檬酸法成功合成了(Bi _0.2 Na _0.2 K _0.2 La _0.2 Sr _0.2 )(Ti _1-x Sc _x )O ₃ (BNKLST- x Sc)高熵陶瓷(HECs)。全面研究了Sc掺杂对HECs的晶格结构、微观结构形态、介电和储能性能的影响。结果表明，虽然在B位掺杂的Sc ³⁺不会使BNKLST的钙钛矿结构与单相交替，但会导致TiO ₆八面体中的晶格膨胀和键合减弱。BNKLST- x的介电常数由于纳米区域中增强的结构不均匀性，Sc 降低，而介电弛豫随着 Sc 含量x的增加而增强。此外，BNKLST-0.2Sc 的晶格结构在 30-300 ℃下表现出超高的热稳定性，最大​​储能密度为 1.094 J/cm ³，效率优于 80%，伴随着机械和介电损耗低至 ~ 10 ^–3。BNKLST-0.2Sc 具有超高功率密度、高能量密度、热稳定性以及低机械和介电损耗的优异组合，有望成为电容器和储能器件中很有前途的介电材料。