High-entropy concept introduced with a promising paradigm to obtain exotic physical properties has motivated us to explore the thermoelectric properties of Sr-substituted high-entropy rare-earth cobaltates i.e., (LaNdPrSmEu)_1-xSr_xCoO₃ (0 ≤ x ≤ 0.10). The structural analysis of the samples, synthesized using the standard solid-state route, confirms the orthorhombic structure with the Pbnm space group. The Seebeck coefficient and electrical resistivity decrease with rising Sr concentration as well as with an increase in temperature. The multiple A-site ions in high-entropy rare-earth cobaltates result in an improved Seebeck coefficient (α) compared to La_0.95Sr_0.05CoO₃, associated with a decrease in the CoOCo bond angle, which further enhances the power factor. The random distribution of cations at the rare-earth site results in a significant lowering of phonon thermal conductivity. As a result, a maximum figure of merit (zT) of 0.23 is obtained at 350K for (LaNdPrSmEu)_0.95Sr_0.05CoO₃, which is one of the highest values of zT reported at this temperature for oxide materials. This study shows promise to decouple thermoelectric parameters using the high-entropy concept in several materials.

引入高熵概念以及获得奇特物理性质的有前途的范例促使我们探索 Sr 取代的高熵稀土钴酸盐的热电性质，即(LaNdPrSmEu) _{1 -x} Sr _x CoO ₃ (0 ≤ x  ≤ 0.10）。使用标准固态路线合成的样品的结构分析证实了具有Pbnm空间群的正交结构。塞贝克系数和电阻率随着 Sr 浓度的升高以及温度的升高而降低。高熵稀土钴酸盐中的多个 A 位离子导致塞贝克系数 ( α) 与 La _0.95 Sr _0.05 CoO ₃相比，与 Co O Co 键角的减小相关，这进一步提高了功率因数。稀土位置处阳离子的随机分布导致声子热导率显着降低。结果，(LaNdPrSmEu) _0.95 Sr _0.05 CoO ₃在 350K 获得了 0.23 的最大品质因数 (zT) ，这是氧化物材料在该温度下报道的最高 zT 值之一。这项研究表明有望在多种材料中使用高熵概念来解耦热电参数。