论文标题
Aurivillius相晶状体氧化物复合材料中巨大的塞贝克系数
Colossal Seebeck coefficient in Aurivillius Phase-Perovskite Oxide Composite
论文作者
论文摘要
我们提出了一种廉价的可扩展方法，用于通过利用Aurivillius相氧化物中的天然超晶格结构来实现极高的Seebeck系数（$α$）。特别是，我们报告了300 \，k，k的$α\ $ 319 \，mv/k，k，k中的aurivillius阶段复合srbi $ _4 $ _4 $ ti $ _4 $ _4 $ o $ o $ _ {15} $（作为矩阵）和perovskite相位材料（例如，perovskite）（例如，perovskite） la $ _ {0.7} $ sr $ _ {0.3} $ mno $ _3 $或，la $ _ {0.7} $ sr $ _ {0.3} $ COO $ _3 $作为填充物）。如此巨大的$α$价值可以归因于由于bi $ _2 $ o $ $ _2 $ layer的有效低维特征，因此状态密度增强的贡献。相应的热导率（$κ$）和电导率（$σ$）分别在0.7-1.25 w/m -k和10-100 $μ$ s/m的范围内，分别为300 \，k。归因于高$α$值，这种氧化物复合材料可用作热电射击传感器和高度敏感的冲线应用。我们预计，使用简单的合成策略的巨大$α$氧化物复合材料的演示也为高温热电应用的未来物质创新奠定了基础。
We propose an inexpensive scalable approach for achieving extremely high values of Seebeck coefficient ($α$) by exploiting the natural superlattice structure in Aurivillius phase oxides. In particular, we report an $α\approx $ 319\,mV/K at 300\,K in a composite of Aurivillius phase compound SrBi$_4$Ti$_4$O$_{15}$ (as a matrix) and a perovskite phase material (e.g., La$_{0.7}$Sr$_{0.3}$MnO$_3$ or, La$_{0.7}$Sr$_{0.3}$CoO$_3$ as filler). Such a colossal value of $α$ can be attributed to contributions from the enhanced density of states due to the effective low dimensional character of Bi$_2$O$_2$ layer. The corresponding thermal conductivity ($κ$) and the electrical conductivity ($σ$) lies in the range 0.7 - 1.25 W/m-K and 10 - 100 $μ$S/m, respectively at 300\,K. Attributed to the high $α$ values, such oxide composites can be used as thermopile sensors and highly sensitive bolometric applications. We anticipate that the demonstration of colossal $α$ in oxide composites using a simple synthesis strategy also sets the stage for future material innovations for high temperature thermoelectric applications.
