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Liang YC, Liu RS, Xie Q, Tian ZA, Mo YF, Zhang HT, Liu HR, Hou ZY, Zhou LL, Peng P. Structural evolutions and hereditary characteristics of icosahedral nano-clusters formed in Mg 70Zn 30 alloys during rapid solidification processes. Sci Rep 2017; 7:43111. [PMID: 28230068 PMCID: PMC5322369 DOI: 10.1038/srep43111] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Accepted: 01/19/2017] [Indexed: 01/01/2023] Open
Abstract
To investigate the structural evolution and hereditary mechanism of icosahedral nano-clusters formed during rapid solidification, a molecular dynamics (MD) simulation study has been performed for a system consisting of 107 atoms of liquid Mg70Zn30 alloy. Adopting Honeycutt-Anderson (HA) bond-type index method and cluster type index method (CTIM-3) to analyse the microstructures in the system it is found that for all the nano-clusters including 2~8 icosahedral clusters in the system, there are 62 kinds of geometrical structures, and those can be classified, by the configurations of the central atoms of basic clusters they contained, into four types: chain-like, triangle-tailed, quadrilateral-tailed and pyramidal-tailed. The evolution of icosahedral nano-clusters can be conducted by perfect heredity and replacement heredity, and the perfect heredity emerges when temperature is slightly less than Tm then increase rapidly and far exceeds the replacement heredity at Tg; while for the replacement heredity, there are three major modes: replaced by triangle (3-atoms), quadrangle (4-atoms) and pentagonal pyramid (6-atoms), rather than by single atom step by step during rapid solidification processes.
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Affiliation(s)
- Yong-Chao Liang
- School of Physics and Microelectronics Science, Hunan University, Changsha, 410082, China.,College of Big Data and Information Engineering, Guizhou University, Huaxi District, Guiyang, 550025, China
| | - Rang-Su Liu
- School of Physics and Microelectronics Science, Hunan University, Changsha, 410082, China
| | - Quan Xie
- College of Big Data and Information Engineering, Guizhou University, Huaxi District, Guiyang, 550025, China
| | - Ze-An Tian
- School of Physics and Microelectronics Science, Hunan University, Changsha, 410082, China
| | - Yun-Fei Mo
- School of Physics and Microelectronics Science, Hunan University, Changsha, 410082, China
| | - Hai-Tao Zhang
- School of Physics and Microelectronics Science, Hunan University, Changsha, 410082, China.,Department of electronic and communication engineering, Changsha University, Changsha, 410003, China
| | - Hai-Rong Liu
- College of Materials Science and Engineering, Hunan University, Changsha, 410082, China
| | - Zhao-Yang Hou
- Department of Applied Physics, Changan University, Xi'an, 710064, China
| | - Li-Li Zhou
- Department of Information Engineering, Gannan Medical University, Ganzhou, 341000, China
| | - Ping Peng
- College of Materials Science and Engineering, Hunan University, Changsha, 410082, China
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Muntwiler M, Zhang J, Stania R, Matsui F, Oberta P, Flechsig U, Patthey L, Quitmann C, Glatzel T, Widmer R, Meyer E, Jung TA, Aebi P, Fasel R, Greber T. Surface science at the PEARL beamline of the Swiss Light Source. JOURNAL OF SYNCHROTRON RADIATION 2017; 24:354-366. [PMID: 28009578 PMCID: PMC5182030 DOI: 10.1107/s1600577516018646] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Accepted: 11/21/2016] [Indexed: 05/19/2023]
Abstract
The Photo-Emission and Atomic Resolution Laboratory (PEARL) is a new soft X-ray beamline and surface science laboratory at the Swiss Light Source. PEARL is dedicated to the structural characterization of local bonding geometry at surfaces and interfaces of novel materials, in particular of molecular adsorbates, nanostructured surfaces, and surfaces of complex materials. The main experimental techniques are soft X-ray photoelectron spectroscopy, photoelectron diffraction, and scanning tunneling microscopy (STM). Photoelectron diffraction in angle-scanned mode measures bonding angles of atoms near the emitter atom, and thus allows the orientation of small molecules on a substrate to be determined. In energy scanned mode it measures the distance between the emitter and neighboring atoms; for example, between adsorbate and substrate. STM provides complementary, real-space information, and is particularly useful for comparing the sample quality with reference measurements. In this article, the key features and measured performance data of the beamline and the experimental station are presented. As scientific examples, the adsorbate-substrate distance in hexagonal boron nitride on Ni(111), surface quantum well states in a metal-organic network of dicyano-anthracene on Cu(111), and circular dichroism in the photoelectron diffraction of Cu(111) are discussed.
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Affiliation(s)
| | - Jun Zhang
- Paul Scherrer Institut, Villigen, Switzerland
| | - Roland Stania
- Paul Scherrer Institut, Villigen, Switzerland
- Universität Zürich, Zürich, Switzerland
| | - Fumihiko Matsui
- Nara Institute of Science and Technology (NAIST), Nara, Japan
| | - Peter Oberta
- Paul Scherrer Institut, Villigen, Switzerland
- Institute of Physics, Academy of Sciences of the Czech Republic, Praha Czech Republic
| | | | - Luc Patthey
- Paul Scherrer Institut, Villigen, Switzerland
| | - Christoph Quitmann
- Paul Scherrer Institut, Villigen, Switzerland
- MAX IV Laboratory, Lund University, Lund, Sweden
| | | | - Roland Widmer
- Swiss Federal Laboratories for Materials Science and Technology (Empa), Dübendorf, Switzerland
| | | | - Thomas A. Jung
- Paul Scherrer Institut, Villigen, Switzerland
- Universität Basel, Basel, Switzerland
| | | | - Roman Fasel
- Swiss Federal Laboratories for Materials Science and Technology (Empa), Dübendorf, Switzerland
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