X-ray and UV-Vis-NIR absorption spectroscopy studies of the Cu(I) and Cu(II) coordination environments in mixed alkali-lime-silicate glasses

Grund Bäck L, Ali S, Karlsson S, Wondraczek L, Jonson B (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Journal of Non-Crystalline Solids: X Elsevier

Book Volume: 3

Article Number: 100029

DOI: 10.1016/j.nocx.2019.100029

Abstract

The local structures of Cu(I) and Cu(II) in (20-x)Na2O-xK2O-10CaO-70SiO2 glasses with a copper content of 0.4 mol% have been investigated by Cu K-edge extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES). Complementary data for Cu(II) was derived using UV–Vis-NIR spectroscopy. Indication for mainly linear two-fold coordination of the Cu+ ion was found by both EXAFS and XANES, but other coordination between Cu+ and O2– cannot be excluded. The Cu(I)&O bond lengths were found to be 1.79–1.83 ± 0.02 Å. EXAFS results showed that Cu(II) was mostly present in a Jahn-Teller distorted environment with oxygen, an octahedron with four shorter Cu(II)&O bonds and two longer in axial position. The equatorial bond lengths were found to be 1.89–1.91 ± 0.02 Å and the axial 2.20–2.24 ± 0.02 Å with no effect of the Jahn-Teller distortion of the octahedron when the glass composition was altered.

Authors with CRIS profile

Lothar Wondraczek

Involved external institutions

Friedrich-Schiller-Universität Jena DE Germany (DE) Linnaeus University (LNU) / Linnéuniversitetet SE Sweden (SE) RISE Research Institutes of Sweden SE Sweden (SE)

How to cite

APA:

Grund Bäck, L., Ali, S., Karlsson, S., Wondraczek, L., & Jonson, B. (2019). X-ray and UV-Vis-NIR absorption spectroscopy studies of the Cu(I) and Cu(II) coordination environments in mixed alkali-lime-silicate glasses. Journal of Non-Crystalline Solids: X, 3. https://doi.org/10.1016/j.nocx.2019.100029

MLA:

Grund Bäck, Lina, et al. "X-ray and UV-Vis-NIR absorption spectroscopy studies of the Cu(I) and Cu(II) coordination environments in mixed alkali-lime-silicate glasses." Journal of Non-Crystalline Solids: X 3 (2019).

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