论文标题
高渗透稀土统一的热电特性
Thermoelectric properties of high-entropy rare-earth cobaltates
论文作者
论文摘要
带有有希望的范式引入的高渗透概念以获得异国情调的物理特性，激发了我们探索SR-叠生的高渗透性稀有稀有率的热电学特性。使用标准固态路线合成的样品的结构分析证实了PBNM空间群的正骨结构。随着SR浓度的上升以及温度的升高，Seebeck系数和电阻率降低。与LA $ _ {0.95} $ _ {0.05} $ _ {0.05} $ COO $ _3 $相比，高渗透稀土钴的多个A位离子导致了改善的Seebeck系数（α），这与Co-O-CO键合的减少相关，这进一步增强了功率因素，从而增强了功率。阳离子在稀土位点的随机分布导致声子导热率显着降低。结果，（landprsmeu）$ _ {0.95} $ _ {0.05} $ coo $ _3 $，以350k的价格获得0.23的最大数字（ZT），这是该温度在此温度下报告的ZT的最高值之一。这项研究表明，有望使用几种材料中的高渗透概念将热电参数解脱。
High-entropy concept introduced with a promising paradigm to obtain exotic physical properties has motivated us to explore the thermoelectric properties of Sr-substituted high-entropy rare-earth cobaltates i.e., (LaNdPrSmEu)$_{1-x}$Sr$_x$CoO3 (0 \leq x \leq 0.10). The structural analysis of the samples synthesized using the standard solid-state route, confirms the orthorhombic structure with the Pbnm space group. The Seebeck coefficient and electrical resistivity decrease with rising Sr concentration as well as with an increase in temperature. The multiple A-site ions in high-entropy rare-earth cobaltates result in an improved Seebeck coefficient (α) compared to La$_{0.95}$Sr$_{0.05}$CoO$_3$, associated with a decrease in the Co-O-Co bond angle, which further enhances the power factor. The random distribution of cations at the rare-earth site results in a significant lowering of phonon thermal conductivity. As a result, a maximum figure of merit (zT) of 0.23 is obtained at 350K for (LaNdPrSmEu)$_{0.95}$Sr$_{0.05}$CoO$_3$, 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.
