典型文献
Partnership for eXtreme Xtallography(PX2)-A state-of-the-art experimental facility for extreme-conditions crystallography:A case study of pressure-induced phase transition in natural ilvaite
文献摘要：
Single-crystal x-ray diffraction(SCXRD)is an important tool to study the crystal structure and phase transitions of crystalline materials at elevated pressures.The Partnership for eXtreme Xtallography(PX2)program at the GSECARS 13-BM-C beamline of the Advanced Photon Source aims to provide state-of-the-art experimental capabilities to determine the crystal structures of materials under extreme conditions using SCXRD.PX2 provides a focused x-ray beam(12×18 μm2)at a monochromatic energy of 28.6 keV.High-pressure SCXRD experiments are performed with a six-circle diffractometer and a Pilatus3 photon-counting detector,facilitated by a membrane system for remote pressure control and an online ruby fluorescence system for pressure determination.The efficient,high-quality crystal structure determination at PX2 is exemplified by a study of pressure-induced phase transitions in natural ilvaite[CaFe2+Fe3+Si2O7O(OH),P21/a space group].Two phase transitions are observed at high pressure.The SCXRD data confirm the already-known ilvaite-Ⅰ(P21/a)→ ilvaite-Ⅱ(Pnam)transformation at 0.4(1)GPa,and,a further phase transition is found to occur at 22.8(2)GPa where ilvaite-Ⅱ transforms into ilvaite-Ⅲ(P21/a).The crystal structure of the ilvaite-Ⅲ is solved and refined in the P21/a space group.In addition to the ilvaite-Ⅰ → ilvaite-Ⅱ → ilvaite-Ⅲ phase transitions,two minor structural modifications are observed as discontinuities in the evolution of the FeO6 polyhedral geometries with pressure,which are likely associated with magnetic transitions.
文献关键词：
中图分类号：
作者姓名：
Jingui Xu;Dongzhou Zhang;Sergey N.Tkachev;Przemyslaw K.Dera
作者机构：
School of Ocean and Earth Science and Technology,Hawai'i Institute of Geophysics and Planetology,University of Hawai'i at Manoa,Honolulu,Hawaii 96822,USA;Center for Advanced Radiation Sources,University of Chicago,Chicago,Illinois 60437,USA
文献出处：
引用格式：
[1]Jingui Xu;Dongzhou Zhang;Sergey N.Tkachev;Przemyslaw K.Dera-.Partnership for eXtreme Xtallography(PX2)-A state-of-the-art experimental facility for extreme-conditions crystallography:A case study of pressure-induced phase transition in natural ilvaite)[J].极端条件下的物质与辐射（英文）,2022(02):62-71
A类：
Xtallography,PX2,ilvaite,GSECARS,Pilatus3,ruby,CaFe2+Fe3+Si2O7O,Pnam,FeO6
B类：
Partnership,eXtreme,state,experimental,facility,extreme,conditions,crystallography,case,study,induced,phase,natural,Single,ray,diffraction,SCXRD,important,tool,transitions,crystalline,materials,elevated,pressures,program,BM,beamline,Advanced,Photon,Source,aims,capabilities,determine,structures,under,using,provides,focused,monochromatic,energy,keV,High,experiments,are,performed,six,circle,diffractometer,photon,counting,detector,facilitated,membrane,system,remote,control,online,fluorescence,determination,efficient,high,quality,exemplified,P21,space,group,Two,observed,data,confirm,already,known,transformation,GPa,further,found,occur,where,transforms,into,solved,refined,In,addition,two,minor,structural,modifications,discontinuities,evolution,polyhedral,geometries,which,likely,associated,magnetic
AB值：
0.416636
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