金刚石对顶砧细胞中微X射线吸收近边结构映射的发展。

Development of micro-XANES mapping in the diamond anvil cell.

作者信息

Aquilanti Giuliana, Pascarelli Sakura, Mathon Olivier, Muñoz Manuel, Narygina Olga, Dubrovinsky Leonid

机构信息

European Synchrotron Radiation Facility, 6 rue Jules Horowitz, 38043 Grenoble, France.

出版信息

J Synchrotron Radiat. 2009 May;16(Pt 3):376-9. doi: 10.1107/S0909049509007134. Epub 2009 Mar 20.

DOI:10.1107/S0909049509007134

PMID:19395801

Abstract

Energy-dispersive X-ray absorption spectroscopy is now a well established method that has been applied to a broad range of applications. At the energy-dispersive EXAFS beamline of the ESRF, ID24, the recently achieved 5 x 5 microm focal spot combined with fast acquisition has allowed complex and non-uniform samples to be mapped and images to be obtained where each pixel contains full XAS information. This method has been applied to a study under extreme conditions of pressure and temperature in a diamond anvil cell in transmission mode. The case study was the investigation of the Fe K-edge XANES of (Mg,Fe)SiO(3)-perovskite and (Mg,Fe)O-ferropericlase on decomposition of the spinel-structured olivine [gamma-(Mg,Fe)(2)SiO(4)] at 78 (3) GPa after laser heating at 2200 (100) K.

摘要

能量色散X射线吸收光谱法现已成为一种成熟的方法，已应用于广泛的领域。在欧洲同步辐射装置（ESRF）的ID24能量色散扩展X射线吸收精细结构（EXAFS）光束线上，最近实现的5×5微米焦斑与快速采集相结合，使得能够对复杂和不均匀的样品进行映射，并获得每个像素都包含完整X射线吸收光谱（XAS）信息的图像。该方法已应用于在金刚石对顶砧中以透射模式在极端压力和温度条件下进行的一项研究。案例研究是对尖晶石结构橄榄石[γ-(Mg,Fe)₂SiO₄]在2200(100)K激光加热后于78(3)GPa分解时的(Mg,Fe)SiO₃-钙钛矿和(Mg,Fe)O-铁方镁石的铁K边X射线吸收近边结构（XANES）进行研究。