基于量子动态的二氧化的相位过渡
Bing Zhang1,2,3, Shengbin Chen3, Yang Yang3
1National Engineering Research Center of New Energy Power Generation, North China Electric Power University, Beijing 102206, People's Republic of China. binhu@ncepu.edu.cn.
Physical chemistry chemical physics : PCCP
|August 21, 2023
概括
研究人员使用量子动力学模拟揭示了二氧化 (TiO2) 晶体中的布鲁基特-科伦比特相转换机制. 这项研究提供了对调节TiO2晶相和理解多态过渡的见解.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 量子化学 是一个量子化学.
背景情况:
- 多态材料表现出由其结构特征决定的多种特征.
- 了解相位过渡对于设计材料和创造具有特定性质的新物质至关重要.
研究的目的:
- 阐明二氧化 (TiO2) 从布鲁基特到科伦比特相的相位过渡机制.
- 为调节TiO2晶相组成和理解多态过渡提供理论基础.
主要方法:
- 用量子动力学模拟来研究相位过渡.
- 分析了各种状态的模拟X射线衍射 (XRD) 光谱.
- 进行了Ti-O键断裂和形成的跟踪.
- 计算了[TiO6]八面体的连接性.
- 计算了林德曼参数.
主要成果:
- 布鲁凯特到科伦比特TiO2的重建相位过渡机制被成功揭示.
- 确定了过渡期间的关键结构变化和债券动态.
结论:
- 该研究提供了布鲁基特-科伦比特TiO2阶段过渡的详细机制.
- 预计这些发现将有助于理论调节TiO2晶相和多态过渡机制.
相关概念视频
Properties of Transition Metals
26.2K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
26.2K
UV–Vis Spectroscopy: Molecular Electronic Transitions
1.6K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
1.6K
Deactivation Processes: Jablonski Diagram
731
Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
731
Fermi Level Dynamics
280
The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
280


