相关实验视频

Updated: Jun 11, 2025

Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics

Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics

Published on: August 30, 2024

在岩盐中Cu-Atom的位置SnTe热电合金

Youichirou Kawami^1,2,3, Xuan Quy Tran², Tomokazu Yamamoto^2,3

¹School of Mechanical and Mining Engineering, The University of Queensland, Brisbane, QLD, 4072, Australia.

Advanced materials (Deerfield Beach, Fla.)

|October 4, 2024

概括

这项研究使用原子尺度成像揭示了铜合锡化物热电材料中的铜原子位置. 铜原子占据了不同的位置,使发声子散射能够提高热电性能.

科学领域:

材料科学材料科学材料科学
固态物理固态物理
纳米技术纳米技术

背景情况:

开发先进的热电材料需要理解在原子层面上的剂行为.
精确控制辅助剂的分布对于定制电子和音声特性至关重要.

研究的目的:

为了确定铜 (Cu) 剂在锡化 (SnTe) 热电合金中的精确原子位置.
为了将剂位点占用与材料的热电性质相关联,特别是晶格导热性.

主要方法:

使用Cs校正扫描传输电子显微镜 (STEM) 进行原子尺度成像.
采用能量分散式X射线光谱 (EDS) 在原子层面进行元素分析.
在Cu-doped SnTe热电合金中研究了剂分布.

主要成果:

揭示了Cu原子不仅占据了预期的Sn位点,而且在岩盐SnTe结构中占据了Te位点.
在面中心立方格内的间隙四面体和crowdion位点确定了Cu原子.
观察到多样化的剂位点占用,表明SnTe矩阵中Cu的高灵活性.

结论:

在SnTe中多个位置上的Cu原子的灵活占用促进了各种各样的声子散射机制.
这种原子层次的理解有助于精确的剂工程,以优化热电材料.
这些发现加速了具有超低晶格导热率的高性能热电合金的开发.

关键词:

密度函数理论密度函数理论能量分散式X射线光谱学扫描传输电子显微镜扫描传输电子显微镜热电能是热电的产品.锡 Telluride 是一种硫化.

更多相关视频

Epitaxial Growth of Perovskite Strontium Titanate on Germanium via Atomic Layer Deposition

Epitaxial Growth of Perovskite Strontium Titanate on Germanium via Atomic Layer Deposition

Published on: July 26, 2016

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation

Published on: February 5, 2020

相关概念视频

Metallic Solids

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....

Ionic Crystal Structures

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...