Structure Refinement of the Icosahedral AlPdMn Quasicrystal Using Quantitative CBED |
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作者姓名: | YU Feng-mei FANG Ai-hua ZOU Hua-min WANG Ren-hui DUAN Xiao-feng .School of Physics and Technology Wuhan University Wuhan Hubei China .Center for Electron Microscopy Wuhan University Wuhan Hubei China .Beijing Laboratory of Electron Microscopy Institute of Physics and Center for Condensed Matter Physics Chinese Academy of Sciences Beijing China |
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作者单位: | YU Feng-mei 1,FANG Ai-hua 1,ZOU Hua-min 1,2,WANG Ren-hui 1,2,DUAN Xiao-feng 3 1.School of Physics and Technology,Wuhan University,Wuhan 430072,Hubei,China; 2.Center for Electron Microscopy,Wuhan University,Wuhan 430072,Hubei,China; 3.Beijing Laboratory of Electron Microscopy,Institute of Physics and Center for Condensed Matter Physics,Chinese Academy of Sciences,Beijing 100080,China |
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基金项目: | Supported by the National Natural Science Foundation of China (59871034) |
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摘 要: | 0 IntroductionQuasicrystals are a form of matter that differs fromother two forms, crystalline and amorphous, bypossessing a quasiperiodic translational order and a non crystallographic orientational order. The atomic structureof quasicrystals is now mostly understood by means ofhigh dimensional crystallography. In this scheme the pe riodicity is recovered in a six dimensional (6D) space forstructures presenting icosahedral symmetry. The periodicspace decomposes into two subspaces: the pa…
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Structure Refinement of the Icosahedral AlPdMn Quasicrystal Using Quantitative CBED |
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Abstract: | The atomic structure of the perfect AlPdMn icosahedral phase has been studied on a single crystal specimen by quantitative convergent beam electron diffraction (QCBED) technique in combination with describing the shape of atomic surface by symmetry\|adapted series of surface harmonics. The spherical model was used as the starting model for the refinement. By fitting the calculated electron diffraction intensities to the experimental line scan profile, the coefficients in the surface harmonics expansion of the boundaries of atomic surface are refined. The refined parameters show that the fluctuations of the external boundary of atomic surface for Pd at n 0 can be as large as 0.2 nm. The boundaries of atomic surfaces for Mn show little fluctuation. In the present model, the number of unphysically short interatomic distances is significantly reduced in comparison with the spherical model. |
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Keywords: | quasicrystal quantitative convergent beam electron diffraction (QCBED) i \|AlPdMn |
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