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Instruments / Technical Area	Publication Details	Published	Actions
I20-Scanning-X-ray spectroscopy (XAS/XES)	Eu3+ exchange in high-charge synthetic Mica-2 for radioactive waste storage applications M. T. Candela , R. Martín-Rodríguez , R. Valiente , A. C. Perdigon , S. Diaz-Moreno , F. Aguado DOI: 10.1007/978-94-024-2138-5_30 Show Abstract ▼ Abstract: High charge synthetic Na-Mica-2 has been synthesized by the NaCl melt method. The Na+ cations in the interlayer space of the clay have been exchanged with Eu3+ ions by a cation exchange reaction. The correct incorporation of Eu3+ and further characterization of its coordination environment and location within the clay, as well as its optical properties, have been studied by means of x-ray diffraction, x-ray absorption (XANES and EXAFS), thermogravimetry and luminescence. Different structural scenarios for the incorporation of europium have been proposed and evaluated.	May 2022
I15-Extreme Conditions	Pressure-induced spin transition and site-selective metallization in CoCl2 Jose A. Barreda-Argüeso , Lucie Nataf , Fernando Aguado , Ignacio Hernandez , Jesús González , Alberto Otero-De-La-Roza , Víctor Luaña , Yating Jia , Changqing Jin , Bongjae Kim , Kyoo Kim , Byung I. Min , Heribert Wilhelm , Andrew P. Jephcoat , Fernando Rodriguez Scientific Reports 9, 9 DOI: 10.1038/s41598-019-41337-4 Diamond Proposal Number(s): [832, 1655, 6078] Open Access Show Abstract ▼ Abstract: The interplay between spin states and metallization in compressed CoCl2 is investigated by combining diffraction, resistivity and spectroscopy techniques under high-pressure conditions and ab-initio calculations. A pressure-induced metallization along with a Co2+ high-spin (s = 3/2) to low-spin (S = 1/2) crossover transition is observed at high pressure near 70 GPa. This metallization process, which is associated with the p-d charge-transfer band gap closure, maintains the localization of 3d electrons around Co2+, demonstrating that metallization and localized Co2+ -3d low-spin magnetism can coexist prior to the full 3d-electron delocalization (Mott-Hubbard d-d breakdown) at pressures greater than 180 GPa.	Apr 2019

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