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

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

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...

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Main Authors: Lina Grund Bäck, Sharafat Ali, Stefan Karlsson, Lothar Wondraczek, Bo Jonson
Format: Article
Language:English
Published: Elsevier 2019-09-01
Series:Journal of Non-Crystalline Solids: X
Online Access:http://www.sciencedirect.com/science/article/pii/S2590159119300421
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spelling doaj-4471b558636f458588501e2151fbfbf02020-11-25T00:07:12ZengElsevierJournal of Non-Crystalline Solids: X2590-15912019-09-013X-ray and UV-Vis-NIR absorption spectroscopy studies of the Cu(I) and Cu(II) coordination environments in mixed alkali-lime-silicate glassesLina Grund Bäck0Sharafat Ali1Stefan Karlsson2Lothar Wondraczek3Bo Jonson4Department of Built Environment and Energy Technology, Linnaeus University, SE-35195 Växjö, Sweden; RISE Research Institutes of Sweden, Division of the Built Environment, Glass Section, SE-35196 Växjö, Sweden; Corresponding authors at: RISE Research Institutes of Sweden, Division of the Built Environment, Glass Section, SE-35196 Växjö, Sweden.Department of Built Environment and Energy Technology, Linnaeus University, SE-35195 Växjö, SwedenRISE Research Institutes of Sweden, Division of the Built Environment, Glass Section, SE-35196 Växjö, Sweden; Otto Schott Institute of Materials Research, Friedrich Schiller University of Jena Fraunhoferstraße 6, D-07743 Jena, Germany; Corresponding authors at: RISE Research Institutes of Sweden, Division of the Built Environment, Glass Section, SE-35196 Växjö, Sweden.Otto Schott Institute of Materials Research, Friedrich Schiller University of Jena Fraunhoferstraße 6, D-07743 Jena, Germany; Abbe Center of Photonics, Friedrich Schiller University of Jena, Max-Wien-Platz 1, D-07743 Jena, GermanyDepartment of Built Environment and Energy Technology, Linnaeus University, SE-35195 Växjö, SwedenThe 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. Keywords: Mixed alkali, Ligand field theory, UV–Vis-NIR, EXAFS, XANES and Jahn-Teller distortionhttp://www.sciencedirect.com/science/article/pii/S2590159119300421
collection DOAJ
language English
format Article
sources DOAJ
author Lina Grund Bäck
Sharafat Ali
Stefan Karlsson
Lothar Wondraczek
Bo Jonson
spellingShingle Lina Grund Bäck
Sharafat Ali
Stefan Karlsson
Lothar Wondraczek
Bo Jonson
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
author_facet Lina Grund Bäck
Sharafat Ali
Stefan Karlsson
Lothar Wondraczek
Bo Jonson
author_sort Lina Grund Bäck
title X-ray and UV-Vis-NIR absorption spectroscopy studies of the Cu(I) and Cu(II) coordination environments in mixed alkali-lime-silicate glasses
title_short X-ray and UV-Vis-NIR absorption spectroscopy studies of the Cu(I) and Cu(II) coordination environments in mixed alkali-lime-silicate glasses
title_full X-ray and UV-Vis-NIR absorption spectroscopy studies of the Cu(I) and Cu(II) coordination environments in mixed alkali-lime-silicate glasses
title_fullStr X-ray and UV-Vis-NIR absorption spectroscopy studies of the Cu(I) and Cu(II) coordination environments in mixed alkali-lime-silicate glasses
title_full_unstemmed X-ray and UV-Vis-NIR absorption spectroscopy studies of the Cu(I) and Cu(II) coordination environments in mixed alkali-lime-silicate glasses
title_sort x-ray and uv-vis-nir absorption spectroscopy studies of the cu(i) and cu(ii) coordination environments in mixed alkali-lime-silicate glasses
publisher Elsevier
series Journal of Non-Crystalline Solids: X
issn 2590-1591
publishDate 2019-09-01
description 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. Keywords: Mixed alkali, Ligand field theory, UV–Vis-NIR, EXAFS, XANES and Jahn-Teller distortion
url http://www.sciencedirect.com/science/article/pii/S2590159119300421
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