ブックタイトル日本結晶学会誌Vol61No3

概要

日本結晶学会誌Vol61No3

Changyong PARK, Arun S. BOMMANNAVAR, Paul CHOW, Richard A. FERRY, Rostislav HRUBIAK, Curtis KENNEY-BENSON, Yue MENG,Dmitry POPOV, Eric ROD, Guoyin SHEN, Jesse S. SMITH, Maddury S. SOMAYAZULU, Nenad VELISAVLJEVIC, Yuming XIAOFig.4 Two pre-defined setups for XRD and XAS at 16-BM-D.(a)(b)Fig.5（a）Setup for in-situ and in-operando high-pressure Laue micro-diffraction（adapted from Ref.18）and（b）setup forEDXD coupled with Paris-Edinburgh Cell application（adapted from Ref.19）at 16-BM-B white X-ray beamline.to adapt various sample environments including cryo-coolingand resistive heating. The applications support generic highpressurediffraction experiments with materials that are notsuffering from relatively lower incident flux compared to thatfrom the insertion device source.5．16-BM-B：White-beam diffraction andradiography beamline16-BM-B beamline is a white X-ray beamline applyingLaue X-ray diffraction and energy dispersive X-ray diffraction（EDXD）techniques for in-situ high-pressure experiments.Thetwotechniquesareoperatedontwoseparatetables;thewhite-Laue table is equipped with 2（v）×2（h）μm 2 focusingKB-mirrors, high-precision stages capable of 2D scanningLaue diffraction microscopy, 17）and a versatile detectormount accepting Perkin-Elmer detector at various anglesand distances（Fig.5a）18）; the EDXD table is exclusivelyfor portable large-volume press applications（e.g., Paris-Edinburgh Cell, or PEC）featured with adjustable diffractedbeam collimators and Ge solid-state detector on 2θrotationarm（Fig.5b）19）utilizing both parallel and vertically-focusedincident beams. The parallel white beam is useful for X-rayradiography, especially, for the samples mounted in PEC,having substantially larger diameter（0.1～2.0 mm）in beamdirection compared to those in a DAC（typically 10～100μm）. The parallel-beam radiography is critically importantto enable comprehensive study of liquids under highpressureand high-temperature conditions, combining liquidstructure, ultrasonic velocity（elastic moduli measurement）,and viscosity measurement in PEC. 20）Recently, the PECapplications have been extended to extreme conditionsnear Earth’s core-mantle boundary using double-stagecompression technique. 21）,22）6．Concluding RemarksHPCAT continues to strive toward：development ofcutting-edge synchrotron based high pressure experimentalprobes, innovation of new high-pressure capabilities, and166日本結晶学会誌第61巻第3号（2019）