Development of micro-XANES mapping in the diamond anvil cell

Giuliana Aquilanti (1) , Sakura Pascarelli (1) , Olivier Mathon (1) , Manuel Muñoz (2) , Olga Naryginac (3) , Leonid Dubrovinsky (3)

1 ESRF - European Synchrotron Radiation Facility
2 LGCA - Laboratoire de Géodynamique des Chaines Alpines
3 Bayerisches Geoinstitut - Bavarian Research Institute of Experimental Geochemistry and Geophysics

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.

Mots clés: XANES; high pressure

Domaines: Géophysique [physics.geo-ph]; Géophysique [physics.geo-ph]; Milieux et Changements globaux

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, 2009, 16 (3), pp.376-379. ⟨10.1107/S0909049509007134⟩. ⟨insu-00411708⟩