合成因子对FeTe2通过固态反应制备的微观结构和热电特性的影响
Lang Zhang1,2, Bingke Qin2, Cheng Sun1
1College of Physical Science and Technology, Dalian University, Dalian 116622, China.
Materials (Basel, Switzerland)
|November 25, 2023
概括
研究人员为热电应用合成了单相FeTe2. 最佳条件产生了低导热率和1.57 × 10^-2的峰值ZT,显示了热电器件的潜力.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 热电能是一种热电能.
背景情况:
- 铁化物 (FeTe2) 是一种半金属化合物,具有固有的低导热性.
- 它作为热电材料的潜力需要优化合成和性能.
研究的目的:
- 通过两步烧结方法合成单相FeTe2.
- 研究烧结温度,保持温度和保持时间对FeTe2热电特性的影响.
- 分析相组合,微观结构和电传输特征.
主要方法:
- 用于FeTe2合成的两步烧结方法.
- 阶段组成和微观结构的系统分析.
- 测量电阻力,西贝克系数和热导率.
主要成果:
- 在823K合成的单相FeTe2,保持时间为10-60分钟.
- 热电特性随着持久时间的延长而降低.
- 最佳条件 (823 K, 30 分钟) 产生了最小电阻 (6.9 mΩ·cm).
- 最大Seebeck系数 (65.48 μV/K) 和功率系数 (59.54 μW/(m·K2)) 在823 K达到10分钟.
- 在375K的温度下,最小的导热率为1.46W/m·K.
- 观察到的1.57 × 10^-2的最大优点 (ZT) 值.
结论:
- 两步烧结方法对于生产单相FeTe2.2有效.
- 优化的烧结参数对于最大化热电性能至关重要.
- FeTe2 具有有前途的热电特性,特别是由于其微观结构的低导热性.
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