Controlled thermal expansion and thermoelectric properties of Mg2Si/Si composites
Controlled thermal expansion and thermoelectric properties of Mg2Si/Si composites
复制标题
DOI：
10.1063/5.0057137
复制
发表时间：
2021-07
影响因子：
3.2
通讯作者：
Jia Fu;S. Tanusilp;Masaya Kumagai;Y. Ohishi;K. Kurosaki
中科院分区：
文献类型：
--
作者：
Jia Fu;S. Tanusilp;Masaya Kumagai;Y. Ohishi;K. Kurosaki
热电模块由n型和p型材料组成，其性能通过材料的无量纲品质因数zT来评估，期望zT尽可能高。此外，由于热电模块被设计为在不同的温度范围内工作，因此应考虑每种材料响应温度变化的变形率（也称为热膨胀）。如果热电模块中的 n 型和 p 型材料的热膨胀差异过大，可能会导致多个器件出现故障并随着时间的推移而导致性能下降的风险。因此，要实现实际应用，不仅zT，n型和p型材料的兼容性也是至关重要的参数。在这项研究中，我们展示了一种用于最小化 n 型 Mg2Si 和 p 型高锰硅化物之间热膨胀率差异的技术，这两种材料是用于实际热电模块的有前途的材料。
A thermoelectric module is composed of n- and p-type materials, and its performance is evaluated by the materials' dimensionless figure of merit, zT, which is expected to be as high as possible. Moreover, because a thermoelectric module is designed to operate in various temperature ranges, the rate of each material's deformation in response to a change in temperature, also called thermal expansion, should be considered. If n- and p-type materials in a thermoelectric module have a too large difference in the thermal expansion, it could lead to risks of several device failures and reduction in performance over time. Thus, to achieve practical use, not only zT but also the compatibility of n- and p-type materials are also crucial parameters. In this study, we demonstrated a technique used to minimize the difference of thermal expansion rate between n-type Mg2Si and p-type higher manganese silicide, which are the promising materials used for a practical thermoelectric module.