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相关概念视频

Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

2.1K
Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
2.1K
Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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通过对晶体化加硬氧化玻璃通过对晶体化.

Hu Tang1,2,3, Yong Cheng4, Xiaohong Yuan5

  • 1Bayerisches Geoinstitut, University of Bayreuth, Bayreuth, Germany. hutang@jlu.edu.cn.

Nature materials
|August 7, 2023
PubMed
概括

研究人员通过诱导准晶体化,在氧化玻璃中实现了异常硬化. 这种新的方法产生了类似晶体的集群,显著提高了玻璃的性,并使材料能够耐损坏.

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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
  • 玻璃科学 玻璃科学

背景情况:

  • 玻璃缺乏晶体材料中发现的微观结构硬化机制,限制了它们的应用.
  • 在不牺牲其他属性的情况下开发固玻璃的方法仍然是一个重大挑战.

研究的目的:

  • 为了研究结晶化作为一种固氧化玻璃的策略.
  • 了解对晶体玻璃增强性的结构起源.

主要方法:

  • 酸玻璃的高压和高温处理.
  • 玻璃结构和机械性能的实验性表征.
  • 计算建模以阐明变形机制.

主要成果:

  • 通过准晶体化实现了类似晶体的中距离顺序集群的均形成.
  • 在甲晶氧化物玻璃 (1.99 ± 0.06 MPa·m1/2) 中表现出优越的性.
  • 观察到的塑性变形特征归因于应力诱导的反转变和剪切带激发.

结论:

  • 准晶体化为设计高耐损氧化玻璃材料提供了一种强有力的策略.
  • 原子层面的结构变化,比如准晶体化,对玻璃的性能有着深刻的影响.
  • 这种方法克服了眼镜内在的脆性限制.