Ab Initio分子动力学研究三价稀土丰富玻尿酸玻璃:结构见解和形成机制
Takahiro Ohkubo1, Shunta Sasaki2, Atsunobu Masuno2
1Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho Inage-ku, Chiba 263-8522, Japan.
The journal of physical chemistry. B
|November 11, 2024
概括
稀土酸盐玻璃是使用ab initio分子动力学模拟的. 氧化兰作为网络修饰剂,增加孤立的酸盐单位,影响玻璃结构.
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
- 固态化学 固态化学
背景情况:
- 含有三价稀土元素的酸盐玻璃在各种技术应用中至关重要.
- 了解这些玻璃的原子层结构和结合,对于定制它们的特性至关重要.
- 之前的研究通常依赖于实验技术,限制了原子规模的详细结构见解.
研究的目的:
- 使用ab initio分子动力学 (AIMD) 模拟,模拟三价稀土 (RE) 丰富的酸盐玻璃的结构.
- 调查La2O3和Y2O3在酸玻璃网络修改中的作用.
- 为了阐明不同酸盐单位在融灭过程中的形成路径.
主要方法:
- 初始分子动力学 (AIMD) 模拟用于La2O3-B2O3和Y2O3-B2O3玻璃系统.
- 模拟了化灭路线以模仿玻璃形成.
- 从AIMD衍生的结构与实验结构因子和11B固态核磁共振 (NMR) 数据进行了验证.
主要成果:
- AIMD模拟成功复制了实验结构数据,验证了模拟方法.
- 鉴定了孤立的酸盐单元 (单体,二元,三元) 和聚合物单元 (带有和没有三环).
- 增加La2O3含量导致了更多的孤立单元,证实了La3+作为网络修饰器.
- 过渡矩阵揭示了孤立单元形成的反应路径,其中稳定了含有聚合物的三环.
- 分析了RE协调结构,显示了YBO3中独特的Y协调,与RE玻璃玻璃不同.
结论:
- AIMD模拟提供了对富含RE的酸盐玻璃结构的原子层面见解.
- 3+离子作为网络修饰剂,打破酸盐网络并促进孤立单元.
- 该研究澄清了酸盐单位的形成机制,并突出了RE协调的差异,为设计新型玻璃材料提供了指导.
更多相关视频
08:00Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
Published on: March 27, 2018
11.0K
06:48Fluid-cell Raman Spectroscopy for operando Studies of Reaction and Transport Phenomena during Silicate Glass Corrosion
Published on: May 9, 2025
208
相关概念视频
02:27Predicting Molecular Geometry
34.1K
VSEPR Theory for Determination of Electron Pair Geometries
34.1K
02:42Valence Bond Theory
8.5K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.5K
02:58Crystal Field Theory - Octahedral Complexes
26.2K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.2K
03:24Hybridization of Atomic Orbitals I
46.5K
The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
46.5K
03:08Hydroboration-Oxidation of Alkenes
7.9K
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
7.9K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
41.6K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
41.6K