相关实验视频
Updated: May 30, 2025
15:04
Picometer-Precision Atomic Position Tracking through Electron Microscopy
Published on: July 3, 2021
6.7K
变压器生成的原子嵌入,以提高预测精度的晶体特性与机器学习的预测精度
Luozhijie Jin1, Zijian Du2, Le Shu1
1School of Information Science and Technology, Fudan University, Shanghai, China.
Nature communications
|January 30, 2025
概括
机器学习加速了使用通用原子嵌入 (UAE) 的晶体材料发现. 基于CrystalTransformer的UAE提高了属性预测的准确性,并在数据库中展示了广泛的适用性.
科学领域:
- 材料科学 材料科学 材料科学
- 计算化学计算化学
- 机器学习 机器学习
背景情况:
- 机器学习加速了对清洁能源等技术的新晶体材料的发现.
- 准确预测材料特性需要有效的原子信息嵌入.
- 传统的嵌入方法在提高预测准确度方面存在局限性.
研究的目的:
- 引入通用原子嵌入 (UAE) 作为一个广泛适用的原子指纹战略.
- 使用CrystalTransformer模型生成阿联张量.
- 评估基于晶体变压器的UAE (ct-UAE) 在材料属性预测中的性能.
主要方法:
- 开发了一个CrystalTransformer模型来生成阿联张量.
- 在已建立的机器学习模型 (CGCNN,ALIGNN,MEGNET) 中,应用ct-UAEs作为原子指纹.
- 在材料项目数据库和混合矿数据库上验证了性能.
主要成果:
- ct-UAEs能够准确地捕捉复杂的原子特征,对形成能量的预测精度提高了14% (CGCNN) 和18% (ALIGNN).
- 在不同的材料数据库中证明了ct-UAEs的良好的可转移性.
- 在预测混合矿的形成能量方面取得了显著的准确性改进 (34%为MEGNET,16%为CGCNN).
结论:
- 基于CrystalTransformer的UAE提供了一种强大的方法来增强材料属性预测.
- 在材料科学中,ct-UAEs显示出解决数据稀缺性挑战的潜力.
- 对ct-UAEs的聚类分析提供了基于原子特征和属性的周期表元素分类的见解.
相关概念视频
02:58Crystal Field Theory - Octahedral Complexes
26.1K
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...
26.1K
02:18X-ray Crystallography
23.8K
The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
23.8K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
41.3K
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,...
41.3K