A Wigner FK RMI, Nukleáris Anyagtudományi Osztályának következő
szemináriuma:

Myrtille Hunault (PhD hallgató, IMPMC, University Pierre and Marie
Curie, Paris)

"Spectroscopic studies of Co2+ speciation in minerals and glasses"

Időpont:
2013. február 22. (péntek), 10:00 óra

Helyszín:
Wigner FK RMI,
III. épület, 2. emelet, tanácsterem
(1121 Bp. Konkoly Thege M. út 29-33.)

Kivonat:

"Cobalt(II) coordination plays a major role in the coloration of
minerals and glasses. Understanding the relation between structure and
properties in minerals is a key element for applying spectroscopic
methods to the investigation of the speciation of Co2+ in glasses. We
focus on the effect of site symmetry on spectroscopic properties. We
present a spectroscopic study of crystalline references bearing Co2+ in
various sites (from 6-fold to 5-fold to 4-fold ). We use optical
absorption, X-ray absorption spectroscopy and RIXS spectroscopy. First
results on the effect of symmetry on HERDF-XANES and RIXS will be
discussed. These results concerning reference compounds will be compared
to the particular case of alkali borate glasses. This original family of
glasses presents drastic changes of the speciation of Co2+ upon the
modification of the glass composition. Perspective investigation,
including multiplet model and DFT calculations will be discussed."

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