玻璃式热传输触发了GeTe的超高热电性能
Debattam Sarkar1, Subarna Das1, Vaishali Taneja1
1New Chemistry Unit, School of Advanced Materials and International Centre for Materials Science, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur P.O., Bangalore, 560064, India.
Advanced materials (Deerfield Beach, Fla.)
|February 16, 2025
概括
研究人员通过诱导玻璃状热传输,在化中实现了超高的热电性能,导致功率 (zT) 约为2.7.7. 这一突破将低热导率与高电导率相结合,以实现高效的能量转换.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 热电学是一种热电学.
背景情况:
- 晶体固体中的晶格导热率 (κlat) 通常很高,与玻璃不同.
- 在具有良好的电性质的晶体材料中实现玻璃般的热传输是不寻常的,但对热电来说是有益的.
研究的目的:
- 为了证明晶体材料的超高热电性能.
- 为了研究在化化中实现玻璃状热传输的机制.
主要方法:
- 球磨和火花等离子烧结BiSe,Pb联合合的多晶体Ge1.03Te.
- 对导热率,导电率和热电功率 (zT) 的分析.
主要成果:
- 取得的最大功率 (zT) 值为≈2.7 (≈2.92以杜隆-佩蒂特热容量为单位).
- 由于铁电不稳定性和软极光学模式,观察到玻璃般的热传输.
- 由于电荷载体平均自由路径 (MFP) 更长,因此保持了高电导率.
- 证明了 ΔT ≈441 K 的有希望的输出功率密度为 ≈0.8 W cm-2 .
结论:
- 联合合的Ge1.03Te通过将玻璃般的热传输与高电导率相结合,显示出出色的热电性能.
- 这些发现为设计高效的中温热电材料开辟了新的途径.
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