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相关概念视频

Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

2.5K
Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred...
2.5K
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.5K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.5K

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相关实验视频

Updated: Jan 18, 2026

Synthesis of Non-uniformly Pr-doped SrTiO3 Ceramics and Their Thermoelectric Properties
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揭示了使用固态反应的铜合CoSb3基热电材料.

Dan Zhao1, Yonghua Ji1,2, Bingke Qin1

  • 1School of Chemistry and Materials Engineering, Liupanshui Normal University, Liupanshui 553004, China.

Materials (Basel, Switzerland)
|September 13, 2025
PubMed
概括

用黄铜和添加的skutterudite (CoSb3) 复合材料显示了改善的热电性能. 这些材料为中温应用提供了增强的功率因子和降低的导热率.

关键词:
黄铜合剂的铜合剂微观结构的微观结构固相反应的固相反应热电材料是一种热电材料.

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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:

  • 基于Skutterudite (CoSb3) 的材料对中温热电应用具有前景.
  • 它们的性能与电气性能和合金设计有关.

研究的目的:

  • 为了合成和表征铜x/Co4Sb11.5Te0.5复合材料.
  • 调查铜和联合剂对热电性质的影响.

主要方法:

  • 合成中使用了高温固态反应.
  • 使用X射线衍射 (XRD),扫描电子显微镜 (SEM) 和能量分散光谱 (EDS) 来进行分析.

主要成果:

  • 观察到的主要晶体结构是CoSb3,具有较小的杂质相.
  • 联合兴奋剂有效调节了载体度,并提高了功率因子.
  • 纳米结构,颗粒边界和缺陷降低了晶格导热率.

结论:

  • 铜0.1/Co4Sb11.5Te0.5在781 K.实现了0.81的高峰热电功率 (ZT) 在781 K.
  • 这项研究表明了优化 skutterudite热电材料的可行策略.