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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 × 5 µm 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)SiO3-perovskite and (Mg,Fe)O-ferropericlase on decomposition of the spinel-structured olivine [[gamma]-(Mg,Fe)2SiO4] at 78 (3) GPa after laser heating at 2200 (100) K.
Keywords : XANES high pressure
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https://hal-insu.archives-ouvertes.fr/insu-00411708
Contributor : Pascale Talour <>
Submitted on : Friday, August 28, 2009 - 3:08:09 PM
Last modification on : Thursday, November 19, 2020 - 3:54:26 PM

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Giuliana Aquilanti, Sakura Pascarelli, Olivier Mathon, Manuel Muñoz, Olga Naryginac, et al.. Development of micro-XANES mapping in the diamond anvil cell. Journal of Synchrotron Radiation, International Union of Crystallography, 2009, 16 (3), pp.376-379. ⟨10.1107/S0909049509007134⟩. ⟨insu-00411708⟩

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