和在化LiF-BeF2中的化学足迹通过第一原理分子动力学模拟来探索
Xuejiao Li1, Yuanyuan Jiang1,2, Yuanyuan Wang1,3
1Key Laboratory of Thorium Energy, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China.
The journal of physical chemistry. A
|February 3, 2025
概括
第一原则分子动力学模拟显示了和在化盐中的独特运输特性. 与含盐相比,含盐具有更高的密度和更好的离子扩散.
科学领域:
- 计算材料科学科学 计算材料科学
- 核工程 核工程是指核工程.
- 物理化学 物理化学
背景情况:
- 化盐,如LiF-BeF2,是先进核反应堆的有希望的介质.
- 了解这些盐中的活性化离子 (和) 的行为对于燃料循环管理和反应堆安全至关重要.
- 之前的研究对这些离子在原子层面的详细化学形式和运输特性提供了有限的见解.
研究的目的:
- 系统地研究和离子在化LiF-BeF2.2中的化学形式和运输特性.
- 分析影响这些离子扩散行为的结构和电子特性.
- 为了建立微观结构和散性性能之间的初步关系的行为剂合融盐.
主要方法:
- 使用第一原理分子动力学 (MD) 模拟来研究化LiF-BeF2与ThF4 (FLiBeTh),UF4 (FLiBeU) 和两者 (FLiBeThU) 合.
- 分析的关键性质包括密度,扩散系数,电子状态密度和离子对/集群结构.
- 引入了一种新的"Be-F四面体应力指数" (SIT),以描述对离子移动性的结构影响.
主要成果:
- 化FLiBeTh的密度和热膨胀系数比FLiBeU在873-1073K之间更高.
- 在FLiBeTh中的活性Th电子增强了电子能量,多样化了协调结构,并改善了扩散特性.
- 在FLiBeU中较高的SIT与Be和F离子的扩散系数较慢相关,表明结构障碍.
结论:
- 第一个原则MD模拟提供了详细的洞察力,在化盐中化离子的结构-属性关系.
- 与离子相比,离子对FLiBe的运输特性有积极的影响.
- 这项研究强调了为优化先进核应用中的扩散性性能而对燃料盐微观结构的描述的重要性.
相关概念视频
Nuclear Transmutation
17.4K
Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
17.4K
Qualitative Analysis
21.4K
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
For instance, group IV...
21.4K
Nuclear Power
7.7K
Controlled nuclear fission reactions are used to generate electricity. Any nuclear reactor that produces power via the fission of uranium or plutonium by bombardment with neutrons has six components: nuclear fuel consisting of fissionable material, a nuclear moderator, a neutron source, control rods, reactor coolant, and a shield and containment system.
Nuclear Fuels
Nuclear fuel consists of a fissile isotope, such as uranium-235, which must be present in sufficient quantity to provide a...
Nuclear Fuels
Nuclear fuel consists of a fissile isotope, such as uranium-235, which must be present in sufficient quantity to provide a...
7.7K
Nuclear Fission
9.5K
Many heavier elements with smaller binding energies per nucleon can decompose into more stable elements that have intermediate mass numbers and larger binding energies per nucleon—that is, mass numbers and binding energies per nucleon that are closer to the “peak” of the binding energy graph near 56. Sometimes neutrons are also produced. This decomposition of a large nucleus into smaller pieces is called fission. The breaking is rather random with the formation of a large...
9.5K
Atomic Fluorescence Spectroscopy
231
Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
231
Radioactivity and Nuclear Equations
20.7K
Nuclear chemistry is the study of reactions that involve changes in nuclear structure. The nucleus of an atom is composed of protons and, except for hydrogen, neutrons. The number of protons in the nucleus is called the atomic number (Z) of the element, and the sum of the number of protons and the number of neutrons is the mass number (A). Atoms with the same atomic number but different mass numbers are isotopes of the same element.
A nuclide of an element has a specific number of protons and...
A nuclide of an element has a specific number of protons and...
20.7K


