title: Development of micro-XANES mapping in the diamond anvil cell.
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.
authors.affiliation: European Synchrotron Radiation Facility, 6 rue Jules Horowitz, 38043 Grenoble, France. aquilanti@esrf.fr
authors.forename: Giuliana
authors.initials: G
authors.lastname: Aquilanti
authors.forename: Sakura
authors.initials: S
authors.lastname: Pascarelli
authors.forename: Olivier
authors.initials: O
authors.lastname: Mathon
authors.forename: Manuel
authors.initials: M
authors.lastname: Muñoz
authors.forename: Olga
authors.initials: O
authors.lastname: Narygina
authors.forename: Leonid
authors.initials: L
authors.lastname: Dubrovinsky
mesh_terms: D017076:Computer-Aided Design; D018130:Diamond; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008904:Miniaturization; D015203:Reproducibility of Results; D053838:Scattering, Small Angle; D012680:Sensitivity and Specificity; D013048:Specimen Handling / Q000295:instrumentation*; D013052:Spectrometry, X-Ray Emission / Q000295:instrumentation*; D014961:X-Ray Diffraction / Q000295:instrumentation*
chemical_list: D018130:Diamond