相关实验视频
Updated: Jul 26, 2025
09:51
Atom Probe Tomography Studies on the CuIn,GaSe2 Grain Boundaries
Published on: April 22, 2013
12.9K
原子图案决定了谷物边界由间位溶液的装饰
Xuyang Zhou1,2, Ali Ahmadian3, Baptiste Gault4,5
1Department of Microstructure Physics & Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, 40237, Düsseldorf, Germany. x.zhou@mpie.de.
Nature communications
|June 14, 2023
概括
颗粒边界吸引溶液,影响材料的性能. 原子图案,而不仅仅是边界方向,决定了溶液分离,使得有针对性的材料设计能够防止故障.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 物理化学 物理化学
背景情况:
- 颗粒边界是晶体材料中的关键接口.
- 在颗粒边界的溶液分离显著影响机械和运输性能.
- 了解颗粒边界结构和溶液组成之间的原子级相互作用至关重要,但具有挑战性,特别是在轻元素中.
研究的目的:
- 研究在铁合金中的粒度边界轻度间位溶液 (和碳) 分离的原子层次机制.
- 阐明谷物边界原子结构,误导和化学组成之间的关系.
- 为设计具有受控粒度边界化学的材料提供见解,以减轻故障机制.
主要方法:
- 使用先进的技术,如电荷密度成像和原子探头断层扫描.
- 直接成像和量化在粒度边界的光间溶解物 (B和C) 的分布.
- 与特定的原子图案和粒度边界平面倾斜度相关联观察到的溶液分离模式.
主要成果:
- 证明了谷物边界原子图案,而不仅仅是误导,支配了轻度间歇溶液的装饰倾向.
- 表明,即使在谷物边界平面倾斜的微小变化,与相同的误导,显著改变边界组成和原子排列.
- 提供了直接的定量证据,证明了在原子尺度上轻的间位溶液分离.
结论:
- 最小的结构特征,原子图案,是粒度边界化学特性的主要控制器.
- 建立了原子结构和粒度边界的化学组成之间的直接联系.
- 开辟了针对性设计和粒边界化学物质被动化的途径,以防止腐蚀,碎和机械故障.
相关概念视频
02:42Ionic Crystal Structures
14.5K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.5K
02:22Structures of Solids
14.3K
Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
14.3K
02:54Molecular and Ionic Solids
17.3K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
17.3K
03:13Intermolecular Forces
58.8K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
58.8K
02:37Metallic Solids
18.5K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
18.5K
02:18Network Covalent Solids
13.6K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
13.6K