通过载体传输和格子工程优化Sm替代的SrSi2中的热电性能
Vikrant Trivedi1, Naohito Tsujii1, Takao Mori1,2
1Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Tsukuba, Japan.
Science and technology of advanced materials
|September 22, 2025
概括
在SrSi2中替代可以通过提高功率因子和降低热导率来提高热电性能. 这导致功率 (ZT) 的峰值值值为0.23,使Sr1-xSmxSi2成为可持续热电器件的有希望的材料.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 无机化学 无机化学 有机化学
背景情况:
- 可持续的热电材料对于能源采集和冷却应用至关重要.
- 从地球上丰富的元素中开发具有成本效益和效率的热电化合物是一个关键的挑战.
- 石化 (SrSi2) 是一个潜在的候选物,但它的热电性能需要优化.
研究的目的:
- 研究 (Sm) 替代对SrSi2.2的热电性质的影响.
- 探索Sm度与Sr1-xSmxSi2.2.中的优点数字 (ZT) 之间的关系.
- 确定最佳组合,以提高热电性能.
主要方法:
- 合成具有不同Sm度的Sr1-xSmxSi2化合物 (x = 0, 0.05, 0.1, 0.15, 0.2).
- 结构性,电子性和热传输性能的表征.
- 对Seebeck系数,电导率,功率因子和热导率的分析.
主要成果:
- 在低水平 (x=0.05) 上替代萨马,提高了SrSi2.2的功率因子.
- 通过引入点缺陷和增强声子散射,sm替换有效地降低了晶格导热率.
- 在室温下,Sr0.95Sm0.05Si2的峰值值值 (ZT) 达到了约0.23,比未使用兴奋剂的SrSi2.2有35%的改善.
- 权重移动性测量为~285cm2/V·s,表明电子运输的有效调节.
结论:
- 替代是一种有效的策略,可以提高SrSi2.2的热电性能.
- 由于其优化的电子和热性能,Sr1-xSmxSi2系统对下一代热电设备具有有前途的潜力.
- 对优化合成和处理的进一步研究可能会导致更高的ZT值.
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