Structure analysis of Zn-Mg-Ho icosahedral quasicrystal by modified Rietveld method using ellipsoid and sphere windows

A structure analysis of Zn-Mg-Ho icosahedral quasicrystal was carried out by the powder X-ray diffraction method using synchrotron radiation (Lambda=0.73490 A) at SPring-8. The intensity distribution was analyzed by the Rietveld method modified for an icosahedral quasicrystal, in which simplified models were assumed: ellipsoid and spherical windows were assumed at five crystallographic sites in a F-type hypercubic unit cell. The analysis revealed the presence of an almost perfect Penrose tiling with edge length 5.20 A. The vertices are occupied alternatively by Zn and Mg, and almost all of the edge centers of the Penrose rhombohedra are occupied by 0.8Zn and 0.2Mg. Ho and Mg atoms tend to be present on the body diagonal of the prolate rhombohedra. Good agreement between the measured and calculated intensity distribution using the simplified model suggests the applicability and the limitation of structure analysis using the powder X-ray diffraction method.Comment: 10 pages, 3 tables, 3 figure

DNAナノ構造体を用いたウイルスの単粒子捕獲と無毒化法の開発 : 平成24年度関西大学若手研究者育成経費研究成果報告書

本研究の⼀部は、平成24年度関⻄⼤学若⼿研究者育成経費において、研究課題「DNAナノ構造体を⽤いたウイルスの単粒⼦捕獲と無毒化法の開発」として研究費を受け、その成果を公表するものである