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相关概念视频

Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

23.6K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
23.6K
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

264
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
264
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

16.6K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
16.6K

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相关实验视频

Updated: May 21, 2025

Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
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原子尺度接口强化解锁了高效和耐用的基于Mg的热电设备.

Wusheng Zuo1, Hongyi Chen2, Ziyi Yu3

  • 1State Key Laboratory of Advanced Fiber Materials, College of Materials Science and Engineering, Donghua University, Shanghai, China.

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|March 18, 2025
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概括

研究人员开发了一种新的原子尺度接口,用于固态热电装置. 这项创新提高了废热转化为电力的稳定性和效率,为更耐用的热电模块铺平了道路.

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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
  • 能源转换 能源转换

背景情况:

  • 固态热电技术为废热回收提供了一个有前途的途径.
  • 由于电极-热电材料接口的长期稳定性问题,广泛采用是有限的.

研究的目的:

  • 设计一个原子级直接粘合接口,以提高热电装置的稳定性和性能.
  • 调查强化学结合对界面特性和设备效率的影响.

主要方法:

  • 使用原子级直接结合制造MgAgSb/Co热电连接.
  • 介面电阻的表征,粘合强度和573K的热稳定性.
  • 在热循环下评估热电模块转换效率和长期耐用性.

主要成果:

  • 实现了2.5μΩ cm2的低界面电阻和60.6 MPa的高粘合强度.
  • 在573 K.的界面证明了高热稳定性.
  • 基于MgAgSb的模块在1440小时的热循环中达到10.2%的转换效率,降解率微不足道.

结论:

  • 原子尺度接口工程对于推进热电半导体设备至关重要.
  • 开发的强大且热稳定的接口显著提高了热电模块的效率和耐用性.
  • 这项工作使废热转化为电能的技术更有效,更可靠.