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相关概念视频

Carrier Transport01:21

Carrier Transport

468
The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
468
Precipitation Gravimetry01:03

Precipitation Gravimetry

6.7K
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
6.7K

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相关实验视频

Updated: Jul 16, 2025

Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics
13:58

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关于原子扩散行为在基超级合金中的第一原则研究.

Yubo Sun1,2, Zhiping Wang1,2, Mingrun Du2

  • 1School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China.

Materials (Basel, Switzerland)
|September 9, 2023
PubMed
概括

基超合金中的原子扩散受,,和等兴奋剂元素的影响. 较大的剂半径增加了扩散障碍,影响制关节结构.

关键词:
基超级合金是基于Ni的超级合金.原子的扩散行为能源屏障是一个能源屏障.这是第一原则.点压缩剂元素的点压缩剂耐火元件是耐火元件的组成部分.

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Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy
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Determining the Mechanical Strength of Ultra-Fine-Grained Metals
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Last Updated: Jul 16, 2025

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科学领域:

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

背景情况:

  • 基于的超级合金在高温应用中至关重要.
  • 是影响合金性能和加工的关键元素.
  • 了解扩散机制对于预测合金行为至关重要.

研究的目的:

  • 为了研究 (Si) 原子在基超合金中的扩散.
  • 分析合金元素 (Cr,Mo,W) 对Si扩散的影响.
  • 提供关于接关节相位结构演变的理论见解.

主要方法:

  • 第一个原则的计算被用来建模超级细胞.
  • 分析了Si原子的位置占用和扩散能量障碍.
  • 评估了多潘特类型和大小对Si扩散的影响.

主要成果:

  • 用Cr,Mo和W进行兴奋剂增强了稳定性,并有利于在八面体位点上占有Si.
  • 增加剂半径通常会增加Si扩散能量屏障.
  • 与Ni原子相比,Si扩散在γ'-Ni3Fe中共享的Fe原子周围明显较低.

结论:

  • 合金元素的选择和尺寸极大地影响了基于Ni的超级合金中的Si扩散.
  • 确定了特定的扩散途径和能源障碍.
  • 这些发现为控制宽间隙接关节中的微结构提供了理论基础.