Researchers at the State Key Laboratory of New Metal Materials, University of Science and Technology Beijing, He Zhanbing and other researchers have recently discovered a new solid material form that subtly resolves the "water and fire incompatibility" of crystals and quasicrystals in the crystal structure. Shows the magical arrangement of atoms. He Zhanbing said that although there is still no in-depth understanding of the physical properties of the material, it is foreseeable that there will be some special physical properties related to the periodicity of the material.
Common material forms are solid, liquid, liquid crystal, gaseous, and plasma. Among them, solid substances can be divided into crystalline, quasi-crystalline and non-crystalline. Quasicrystals are a form of matter that does not have translational symmetry, but has long-range orientation order. Unlike traditional crystalline materials, there is no unit cell in the quasi-crystal that can be periodically and repeatedly arranged, so it does not have translational symmetry. Like water and fire incompatibility, periodic translation is one of the most essential differences between quasi-crystals and traditional crystals. However, the new solid substance form discovered this time is formed by inlaying non-periodic structural blocks between periodically arranged structural blocks. It has the periodic translation symmetry of traditional crystalline materials and the quasi-periodic of quasi-crystals. Together.
Researchers have found that this kind of alloy is different from any known physical state in the Al-Cr-Fe-Si alloy system through transmission electron microscopy, especially the spherical electron aberration correction transmission electron microscope. Novel material form. The state of matter is composed of quasicrystal-related structural blocks, but one of the oriented structural blocks is arranged periodically, with the same translational unit cell as the crystalline material. However, some non-periodically arranged structural blocks are embedded between these periodically arranged structural blocks, which is different from the traditional crystalline phase. Due to the existence of periodic structural blocks, this structure is not a quasi-crystal, and is different from the common non-periodic modulation structure, one-dimensional tubular host-guest structure and related disordered ice structure, which belongs to a new form of matter. The researchers said that although this type of substance is currently only found in alloys, its structural properties are not limited to alloy systems, but can also exist in organic materials, nano self-assembly materials, porous materials and other systems.
The research results were recently published in the classic crystallography journal "Journal of Crystallography A". The research was supported by the National Natural Science Foundation of China (51871015) and the independent project of the State Key Laboratory of New Metal Materials. He Zhanbing, Sun Junliang, School of Chemistry, Peking University, Research Fellow Ma Xiulian, Shenyang Institute of Metal Research, and Walter Stu of the University of Zurich (Walter Steurer) completed in cooperation. (Reporter Cao Xiuying)
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