研究超和变化对{100}个KDP水晶面生长的影响
Biljana Z Maksimović1, Andrijana A Žekić1, Branislava M Vučetić1
1Faculty of Physics, University of Belgrade, Studentski trg 12, Belgrade 11000, Serbia.
ACS omega
|February 10, 2025
概括
{100} KDP晶体的生长速度取决于超和的变化. 降低超和率会产生更高的生长率和更高的表面粗度,这表明螺旋式生长机制是独立于先前条件的.
科学领域:
- 晶体学 晶体学是指结晶学.
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 二酸 (KDP) 晶体在非线性光学中至关重要.
- 了解晶体生长机制对于优化材料特性至关重要.
研究的目的:
- 研究{100}个KDP晶体面的生长动态和表面形态.
- 为了确定不同超和条件对晶体生长的影响.
- 阐明潜在的生长机制,包括核化模型.
主要方法:
- 对{100}个KDP晶体面的受控生长实验,超和范围为6.2-14.7%.
- 使用扫描电子显微镜 (SEM) 和原子力显微镜 (AFM) 进行表面分析.
- 使用抛物线和功率定律模型,对增长率与超和度依赖 (R(σ)) 的数学建模.
主要成果:
- 增长率最大的位置随着超和度的增加和减少而变化,在超和度的减少期间观察到更高的速度.
- 增加的超和导致了更大的表面粗度,正如SEM和AFM所证明的那样.
- 增长率依赖性R ((σ) 通过抛物线和功率定律函数准确地建模,表明螺旋式增长.
- 显著的一小部分晶体面显示出指数n>2,最初表明多重核化,但进一步的分析更倾向于多核模型.
- 在增加和减少超和的实验之间,没有发现平均指数'n'的显著差异.
结论:
- {100} KDP晶体面的生长机制主要由研究超和范围内的多核生长模型控制.
- 晶体生长史 (超和的增加与减少) 并没有显著改变{100}个KDP面的基本生长机制.
- 超和水平直接影响表面形态和生长动力学,对晶体质量和应用有影响.
相关概念视频
Solution Equilibrium and Saturation
16.8K
Imagine adding a small amount of sugar to a glass of water, stirring until all the sugar has dissolved, and then adding a bit more. You can repeat this process until the sugar concentration of the solution reaches its natural limit, a limit determined primarily by the relative strengths of the solute-solute, solute-solvent, and solvent-solvent attractive forces. You can be certain that you have reached this limit because, no matter how long you stir the solution, undissolved sugar remains. The...
16.8K
Recrystallization: Solid–Solution Equilibria
4.1K
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...
4.1K
Crystal Growth: Principles of Crystallization
5.7K
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...
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...
5.7K
Precipitation Processes
5.1K
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
5.1K
Determination of Crystal Structures
139
In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
139


