Ba15Zr14Te42:一种新的复杂的三元化物结构,具有较低的导热率
Sweta Yadav1, Manish K Niranjan2, Jai Prakash1
1Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana 502284, India. jaiprakash@chy.iith.ac.in.
Dalton transactions (Cambridge, England : 2003)
|August 27, 2024
概括
我们合成了一种新的化物,Ba15Zr14Te42,具有热电应用的潜力. 这种材料在高温下表现出超低的晶格导热率和p型半导体性质.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 热电学是一种热电学.
背景情况:
- 具有复杂结构的重金属基化物对于热电 (TE) 应用至关重要.
- 开发具有增强 TE 特性的新材料需要了解它们的结构和电子特性.
研究的目的:
- 为了合成和描述一种新的化物化合物,Ba15Zr14Te42.
- 为潜在的热电应用研究其结构,电子和热性能.
主要方法:
- 通过元素的高温反应合成Ba15Zr14Te42.
- 单晶X射线衍射用于结构确定.
- 光学吸收,电阻,热力和DFT研究用于属性表征.
主要成果:
- Ba15Zr14Te42在三角系统 (空间组R3̄c) 中结晶,与其Se类似物具有同结构.
- 该结构具有∞1[Zr14Te42]链,由Ba2+分离,Zr原子处于八面体和三面体的镜协调.
- 对Ba15Zr14Te42.4的超低晶格导热率 (∼0.46 W mK-1在773 K) 和p型退化的半导体行为被观察到.
结论:
- 15Zr14Te42是热电应用的一个有前途的新材料,由于其复杂的结构和优良的热传输特性.
- 观察到的超低导热率和半导体性质突出了其对高效能源转换的潜力.
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