Study of development of Heusler-type functional materials for high performance thermoelectric thin films

为了将热电材料应用于发电，期望将热电功率因数的峰值温度移动到例如，600 K及以上Fe 2 VAl基热电材料的缺点是热电功率因数的峰值温度<400 K和高的热导率值。为了改善Fe 2 VAl基合金的热电性能，我的五年研究项目的目标是探索新的掺杂和替代元素，并阐明其热电性能改善的机制。结果表明：1）非化学计量比型Fe 2 V1 + xAl 1-x和第四元素掺杂型Fe 2 VAl 1-yTay合金的制备提高了Heusler Fe 2 VAl合金的热电性能。2)说明Heusler Fe 2 VAl合金热电性能的改善。3)用于制备Fe 2 VAl薄膜的薄膜沉积系统的开发。

For the application of thermoelectric materials to power generation, it is desirable to shift the peak temperature of the thermoelectric power factor up to, e.g., 600 K and above. The disadvantages of Fe2VAl-based thermoelectric materials are a peak temperature of the thermoelectric power factor of <400 K and a high thermal conductivity value. To improve the thermoelectric properties of the Fe2VAl-based alloys, the aims of my five-year research project were to explore new doping and substitution elements, and clarify the mechanism by which their thermoelectric properties are improved. The results are:1) Improvement of the thermoelectric properties of the Heusler Fe2VAl alloys due to the fabrication of the off-stoichiometric type Fe2V1+xAl1-x and fourth-element doping type Fe2VAl1-yTay alloys. 2) Clarification of the improvement of the thermoelectric properties of the Heusler Fe2VAl alloys. 3) Development of a thin- film deposition system for the fabrication of Fe2VAl thin films.