niobium-silicon natural composite materialsheat-resistant alloysmicrostructuresingle crystal X-ray diffraction analysisintroduction of stabilizing atomsTheresultsoftheinvestigationofthephaseandquantitativecompositionofreinforcingphasesoftheNb–Nb5Si3insitueutecticcompositeduringhigh-gradientdirectionalcrystallizationarereported...
Figure 2.3.Atomic Structure of Copper 2.3.2Excitation and Atomic Transitions There are energy levels outside the valence shell to which electrons can be excited. Electrons that are excited to these levels will usually return to the lower energy state rapidly with the release of energy in the for...
Nuclear pore complexes (NPCs) mediate bidirectional nucleocytoplasmic transport of substances in eukaryotic cells. However, the accurate molecular arrangement of NPCs remains enigmatic owing to their huge size and highly dynamic nature. Here we determined the structure of the asymmetric unit of the inner...
Combining with the-state-of-the-art aberration-corrected scanning transmission electron microscopy (STEM) and density functional theory (DFT) calculations, local GB structure can be identified at the atomic scale, which profoundly promotes our knowledge of the structure-property correlations in materials...
Additionally, we also merged all MicroED datasets in P21, solved the structure by direct methods and refined to a final Rwork/Rfree of 20/23, comparable with the P212121 >space group. This solution had two chains in the asymmetric unit with an all-atom RMSD of 0.026 Å between ...
The notion of point "particle" electrons orbiting the nucleus is discarded in favour of a compositestanding-waveof electromagnetic energy which defines a spherical force-field. This force-field electron provides the apparent solidity and volume of matter. The electrons "material" structure is continual...
Atomic structure of the nanowire for various transition-metal dichalcogenides: (a) atomic structural model of the nanowire, where dashed red triangles indicate the orientation of each layer in the nanowire, and (b) experimental (left) and simulated (right) STEM Z-contrast images of individual MoSe...
theory of the composition of matter stating that common materials are composed of molecules, which are composed of atoms, which are composed of nuclei and electrons. It holds that the properties of composite entities, such as their structure and behavior, arise from the properties of their ...
Engineering the surface structure at the atomic level can be used to precisely and effectively manipulate the reactivity and durability of catalysts. Here we report tuning of the atomic structure of one-dimensional single-crystal cobalt (II) oxide (CoO) nanorods by creating oxygen vacancies on pyram...
The pursuit of atomic precision structure of porous covalent organic frameworks (COFs) is the key to understanding the relationship between structures and properties, and further developing new materials with superior performance. Yet, a challenge of how to determine their atomic structures has always ...