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Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
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Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
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在Fe-Al扩散对中向快速原子迁移的应变介导缺陷工程.

Zhijie Ding1, Peng Li1, Zhiwei Qin1

  • 1School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China.

Nano letters
|September 6, 2024
PubMed
概括

铁 (Fe-Al) 扩散对中的应变工程显著降低了原子迁移能量障碍. 这种缺陷工程方法增强了沿着位移和颗粒边界的扩散,使材料加工速度更快.

关键词:
铁-的扩散对.缺陷工程是什么?缺陷工程是什么?快速的原子迁移的迁移压力 压力 压力 压力

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科学领域:

  • 材料科学 材料科学 材料科学
  • 物理化学 物理化学
  • 计算材料科学科学 计算材料科学

背景情况:

  • 快速的原子迁移对于处理轻量级Fe-Al扩散对来说至关重要.
  • 设计有效的短路扩散路径对于控制扩散速率至关重要.
  • 了解界面和缺陷的扩散机制是材料优化的关键.

研究的目的:

  • 提出一种应变介导的缺陷工程策略,以增强Fe-Al扩散对中的原子迁移.
  • 为了减少空位激活能量,并改善沿着位移 (DLs) 和谷物边界 (GBs) 的扩散.
  • 通过第一原则计算,研究应变对扩散障碍的影响的潜在机制.

主要方法:

  • 应变介导缺陷工程应用于Fe-Al扩散对.
  • 修改的阿雷尼乌斯类型关系被用来确定界面表面的明显激活能量.
  • 使用第一原则计算来分析扩散障碍和电子结构变化.

主要成果:

  • 缺陷工程使接口表面的明显激活能量减少了约49%,达到139kJ mol-1.1.
  • 在紧张的Fe和Al中引入了高密度的空缺,DL和GB,提供了低能量的扩散路径.
  • 第一个原则的计算证实了由于应变引起的原子空隙键的减弱和变化的电子运输而减少了格子扩散障碍.

结论:

  • 应变介导缺陷工程有效地提高了Fe-Al扩散对中的原子迁移.
  • 异常电子电荷分布和界面吸引力的协同效应促进了原子的快速迁移.
  • 这一策略为控制扩散动力学和优化Fe-Al材料特性提供了一条途径.