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Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

102
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...
102
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

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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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相关实验视频

Updated: Apr 7, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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有一个的即时光子晶体.

Feng Gao1, Junjun Qiu1, Tong An1

  • 1State Key Lab of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

ACS nano
|November 10, 2025
PubMed
概括

我们开发了一种快速的方法,使用合颗粒和简单的剪切来创建高质量的光子晶体. 这种可持续的方法可以使制造速度提高一百万倍,使结构色彩材料的可扩展生产成为可能.

关键词:
合物 合物 合物振荡式剪切方式一个光子晶体的光子.快速组装组装是一个问题.结构色彩 结构色彩

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Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation
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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术
  • 光子学 是一个光子学.

背景情况:

  • 聚合物粒子组装的光子晶体为结构色彩提供了可持续的替代方案.
  • 由于光学质量低下和制造过程缓慢,商业用途受到阻碍.

研究的目的:

  • 为高质量的光子晶体开发一种快速可扩展的制造方法.
  • 调查用于加速组装的矩阵材料和粒子体积分数的使用.

主要方法:

  • 在矩阵材料 (糖醇,蜂蜜) 中嵌入合性颗粒.
  • 应用振荡式剪切 (手动折叠,滚滚) 来快速形成结构.
  • 在剪切和不同的参数下分析组装机制.

主要成果:

  • 与传统方法相比,制造时间加速了10^2-10^6倍.
  • 实现了具有尖反射率峰值 (>90%) 的均光子晶体.
  • 单一剪切振荡 (0.05-0.5秒) 产生了高度有序的结构.

结论:

  • 使用振荡式剪切可以实现快速,可扩展的光子晶体制造.
  • 矩阵材料选择和粒子体积分数是有效组装的关键参数.
  • 这种方法为商业化可持续结构色彩材料提供了切实可行的途径.