在CuInTe2-CuAlTe2固溶液合金中观察到格子导热率的显著降低
Seungchan Seon1, BeomSoo Kim1, Okmin Park1
1Department of Materials Science and Engineering, University of Seoul, Seoul 02504, South Korea. sang1.kim@uos.ac.kr.
Physical chemistry chemical physics : PCCP
|November 13, 2024
概括
这项研究研究了用于热电应用的CuIn1-xAlxTe2合金. 固溶液合金降低了导热率,但由于功率因数较低,热电功率 (zT) 也下降了.
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:
- 像CuInTe2和CuAlTe2这样的第三级焦化物由于高的Seebeck系数和宽带间隔,显示出作为热电材料的潜力.
- 这些化合物共享四角形结构,使它们适合固溶液合金形成.
研究的目的:
- 系统地研究CuIn1-xAlxTe2 (x = 01.0) 固体溶液的电,热和热电性能.
- 了解合金对载体流动性,热导率和整体热电功率 (zT) 的影响.
主要方法:
- 一系列CuIn1-xAlxTe2组合物的合成 (x = 0, 0.2, 0.4, 0.6, 0.8, 1.0).这些组合的组合是:
- 系统测量电导率,西贝克系数和热导率.
- 分析由于固体溶液合金而导致的载体流动性和声子散射效应.
主要成果:
- CuInTe2和CuAlTe2形成了完整的固体溶液.
- 电导率和Seebeck系数随着Al含量增加而下降到x=0.8,降低了功率因子,除了纯CuAlTe2外,它显示出突然增加.
- 总和晶格导热率因合金中增强的声子散射而显著降低,价值低至1.8Wm-1K-1为x=0.4.4.
结论:
- 在CuIn1-xAlxTe2中合金固溶液有效降低热导率.
- 然而,功率因子的降低超过了导热率的降低,导致热电功率 (zT) 显著降低.
- 需要进一步优化,以提高这些合金的热电性能.
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