论文标题
改善热电Zn $ _4 $ SB $ _3 $的操作稳定性
Improving the operational stability of thermoelectric Zn$_4$Sb$_3$ by segmentation
论文作者
论文摘要
混合的离子电子导体$β$ -ZN $ _4 $ _4 $ sb $ _3 $是一种便宜且高性能的热电材料，但是在具有温度梯度和运行电流的工作条件下，该材料会分解，因为Zn很容易在结构中迁移。在这里，我们报告了通过引入不锈钢的离子阻断界面来分割样品，这是通过引入离子阻滞界面来提高$β$ -ZN $ _4 $ _4 $ _4 $ _3 $，这是由快速的单步火花等离子体烧结合成所产生的。与未分段的样品相比，在温度梯度和电流下测试样品的稳定性，这表明分段样品的稳定性显着提高。分段样品在温度梯度下从250°C到室温稳定，没有外部电流，而未分段的样品在相同条件下分解为ZnSB和Zn。分段样品的优点ZT的热电图略有降低，这主要是由于导热率增加。总之，开发了分段的$β$ -ZN $ _4 $ _4 $ _3 $的快速一步合成，该$ _4 $ _3 $正在成功地通过阻止Zn ion迁移来成功提高长期操作稳定性。
The mixed ionic-electronic conductor $β$-Zn$_4$Sb$_3$ is a cheap and high performing thermoelectric material, but under operating conditions with a temperature gradient and a running current, the material decomposes as Zn readily migrates in the structure. Here, we report an improved stability of $β$-Zn$_4$Sb$_3$ by introducing ion-blocking interfaces of stainless steel to segment the sample, produced by a rapid one-step Spark Plasma Sintering synthesis. The stability of the samples is tested under temperature gradients and electric currents, which reveals significantly improved stability of the segmented samples compared to unsegmented samples. The segmented samples are stable under temperature gradient from 250°C to room temperature with no external current, whereas the unsegmented sample decomposes into ZnSb and Zn under the same conditions. The thermoelectric figure of merit, zT, of the segmented sample is slightly reduced, mainly due to the increased thermal conductivity. In conclusion, a rapid one-step synthesis of segmented $β$-Zn$_4$Sb$_3$ is developed, which successfully improves the long-term operational stability by blocking the Zn ion migration.
