Local Ordering Around Tetrahedral Co2+ in Silicate Glasses. Issue 1 (14th December 2013)

• Record Type: Journal Article
• Authors: Hunault, Myrtille; Calas, Georges; Galoisy, Laurence; Lelong, Gérald; Newville, Matthew; Henderson, G. S.
• Is Part Of: Journal of the American Ceramic Society. Volume 97:Issue 1(2014)
• Page Start: 60
• Page End: 62
• Publication Date: 2013-12-14
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.12709
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace12709-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>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 Co²⁺ connected with the glass network, with a ^IVCo–O–Si angle of 134°. Changing the alkali from K⁺ to Na⁺ induces an increase of the local disorder around Co²⁺, 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 Co²⁺ species in glasses.</p> </abstract>