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Local Ordering Around Tetrahedral Co 2+ in Silicate Glasses
Author(s) -
Hunault Myrtille,
Calas Georges,
Galoisy Laurence,
Lelong Gérald,
Newville Matthew
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12709
Subject(s) - extended x ray absorption fine structure , xanes , alkali metal , silicate , silicate glass , tetrahedron , soda lime , spectroscopy , k edge , absorption (acoustics) , materials science , absorption spectroscopy , crystallography , chemistry , inorganic chemistry , analytical chemistry (journal) , mineralogy , optics , physics , organic chemistry , chromatography , quantum mechanics , composite material
Alkali lime silicate glasses containing 5 wt% of CoO were investigated by Co K‐edge XANES and EXAFS and optical absorption spectroscopy. Our results reveal the presence of tetrahedral Co 2+ connected with the glass network, with a IV Co–O–Si angle of 134°. Changing the alkali from K + to Na + induces an increase of the local disorder around Co 2+ , as shown by a decrease of the contribution from the second neighbors in the EXAFS signal. We propose two models for interpreting the structure of the second shell of neighbors. Our results provide a structural basis for rationalizing the optical properties of Co 2+ species in glasses.
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