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Grund Bäck, Lina
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Publications (10 of 12) Show all publications
Grund Bäck, L., Ali, S., Karlsson, S., Möncke, D., Kamitsos, E. & Jonson, B. (2019). Mixed alkali/alkaline earth‐silicate glasses: Physical properties and structure by vibrational spectroscopy. International Journal of Applied Glass Science, 10(3), 349-362
Open this publication in new window or tab >>Mixed alkali/alkaline earth‐silicate glasses: Physical properties and structure by vibrational spectroscopy
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2019 (English)In: International Journal of Applied Glass Science, ISSN 2041-1286, Vol. 10, no 3, p. 349-362Article in journal (Refereed) Published
Abstract [en]

In this article, we investigate the correlation of selected physical properties with structural changes in quaternary mixed modifier alkali/alkaline earth oxide silicate glass systems, focusing either on the mixed alkali effect [(20−x)Na2O–xK2O–10CaO–70SiO2 (x = 0, 5, 10, 15, 20)] or on the mixed alkaline earth effect [20Na2O–(10−y)CaO–yBaO–70SiO2 (y = 0, 5, 10)]. A maximum microhardness and packing density, as well as a minimum glass transition temperature were observed for mixed alkali glasses. The mixed alkaline earth glasses do not exhibit any clear extrema in any of the properties studied. The hardness and glass transition temperature decreases, while the density and molar volume increases with increasing BaO content. Raman spectroscopy showed an increase in the Q3 group compared to the Q2 and Q4 groups as the high field strength ions Na+ or Ca2+ are substituted by their low field strength analogs K+ or Ba2+. In the mixed alkali series, the high field strength ion Na+, seems to push the low field strength ion K+ into lower energy sites when present simultaneously, while such an effect is not apparent for the mixed alkaline earth glasses, where the far IR spectra of mixed glasses are equivalent to the weighted averages of the pure glasses.

Place, publisher, year, edition, pages
American Ceramic Society, 2019
Keywords
mixed modifier effect, silicate glass, glass transition temperature, hardness, Raman spectroscopy and IR spectroscopy
National Category
Ceramics
Research subject
Technology (byts ev till Engineering), Glass Technology
Identifiers
urn:nbn:se:lnu:diva-82150 (URN)10.1111/ijag.13101 (DOI)000470786300008 ()2-s2.0-85066607499 (Scopus ID)
Available from: 2019-04-25 Created: 2019-04-25 Last updated: 2019-08-29Bibliographically approved
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, Article ID 100029.
Open this publication in new window or tab >>X-ray and UV-Vis-NIR absorption spectroscopy studies of the Cu(I) and Cu(II) coordination environments in mixed alkali-lime-silicate glasses
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2019 (English)In: Journal of Non-Crystalline Solids: X, ISSN 2590-1591, article id 100029Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Elsevier, 2019
National Category
Ceramics Materials Chemistry
Research subject
Technology (byts ev till Engineering), Glass Technology
Identifiers
urn:nbn:se:lnu:diva-46870 (URN)10.1016/j.nocx.2019.100029 (DOI)2-s2.0-85068376725 (Scopus ID)
Available from: 2015-10-26 Created: 2015-10-26 Last updated: 2019-09-02Bibliographically approved
Grund Bäck, L. & Lagerbielke, E. (2018). Eternal glass: Rapport - studie om återvinning av glas. Växjö: RISE & Linnaeus University
Open this publication in new window or tab >>Eternal glass: Rapport - studie om återvinning av glas
2018 (Swedish)Report (Other academic)
Place, publisher, year, edition, pages
Växjö: RISE & Linnaeus University, 2018. p. 23
Series
Rapportserie RISE ; 7P01776
Keywords
Glas, återvinning, design, glasteknologi, cirkulär ekonomi
National Category
Design
Research subject
Design
Identifiers
urn:nbn:se:lnu:diva-75728 (URN)
Available from: 2018-06-13 Created: 2018-06-13 Last updated: 2018-06-18Bibliographically approved
Karlsson, S., Grund Bäck, L., Kidkhunthod, P., Lundstedt, K. & Wondraczek, L. (2016). Effect of TiO2 on optical properties of glasses in the soda-lime-silicate system. Optical Materials Express, 6(4), 1198-1216
Open this publication in new window or tab >>Effect of TiO2 on optical properties of glasses in the soda-lime-silicate system
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2016 (English)In: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 6, no 4, p. 1198-1216Article in journal (Refereed) Published
Abstract [en]

Titania is widely considered as an alternative constituent for replacing heavy metal oxides in optical glasses. Its effect on optical properties, however, is complex. This is due to the dielectric properties of the prevalent ionic species, Ti4+, the potential co-existence of trivalent titanium, Ti3+, giving rise to intrinsic and extrinsic charge transfer reactions, and the existence of different coordination polyhedra, depending on matrix composition. Here, we present a systematic study of the optical properties of the soda-lime-silicate glass system as a function of TiO2 addition. We consider the silica-rich region of the SiO2-Na2O-CaO-TiO2 quaternary, which may be taken as model for a variety of technical glasses. Trends are described in the refractive index, the Abbe number, the optical bandgap and the Urbach energy. The addition of TiO2 increases the refractive index and the optical dispersion while it lowers the optical bandgap and the Urbach Energy. Results are discussed in relation to relevant literature data towards using titania silicate glasses as high-index replacements for heavy metal containing oxide glasses. (C) 2016 Optical Society of America

National Category
Materials Engineering
Research subject
Technology (byts ev till Engineering), Glass Technology
Identifiers
urn:nbn:se:lnu:diva-52770 (URN)10.1364/OME.6.001198 (DOI)000373599200027 ()2-s2.0-84975263252 (Scopus ID)
External cooperation:
Available from: 2016-05-30 Created: 2016-05-30 Last updated: 2017-11-30Bibliographically approved
Lagerbielke, E., Grund Bäck, L., Lang, M., Sirkka, T., Johansson, L. & Carlsson, C. (2016). Förstudie - Ny glasgång för Kulturparken Småland: Hur kan transparent intelligens utnyttjas i en offentlig miljö?. Växjö: Smart Housing Småland
Open this publication in new window or tab >>Förstudie - Ny glasgång för Kulturparken Småland: Hur kan transparent intelligens utnyttjas i en offentlig miljö?
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2016 (Swedish)Report (Other academic)
Abstract [sv]

Tankarna på att bygga en glasgång mellan Smålands museum och Utvandrarnas hus har funnits ett tag. När det kommunala fastighetsbolaget Vöfab köpte museibyggnaden av Stiftelsen Smålands museum i december 2014 och all mark mellan byggnaderna så var ett avgörande juridiskt hinder undanröjt. Nu fanns det möjlilghet att bygga en glasgång.

Förstudiens mål är att synliggöra och tvärvetenskapligt undersöka möjligheterna att använda transparent intelligens vid gestaltning av en ny glasgång som ett tilltalande inslag i Växjös offentliga miljö.

I rapporten beskrivs transparent intelligens och ger många exempel inklusive figurer, både på tekniker och också byggnader. I rapporten berättas också omkonstnärlig gestaltning och utmanande arkitektur, materialet glas beskrivs både ingenjörsmässigt och designmässigt.

Förstudien visar vilka möjligheter det finns att använda transparent intelligens när en offentlig byggnad ska byggas, men också vilka begränsningar (t.ex. ljud, ljus, värme, kyla, underhållsvänlighet, teknik). En litteratursökning har visat att det finns byggnader som fungerar som en dekoration samtidigt som det har en funktion, i en offentlig miljö.

I och med att det händer mycket inom området intelligent transparens så byggs det nya prototyper med den senaste tekniken eller en gammal teknik som används på ett nytt sätt. Inom Smart Housing Småland görs det nya prototyper i samarbete med industrin, som kan visas upp i glasgången, om den blir verklighet. Detta gör att allmänheten får ta del av den senaste tekniken inom intelligent transparens.

Place, publisher, year, edition, pages
Växjö: Smart Housing Småland, 2016. p. 38
Series
SHS-rapport ; 2016-10
Keywords
Design, glas, transparent intelligens
National Category
Design
Research subject
Design
Identifiers
urn:nbn:se:lnu:diva-75733 (URN)
Available from: 2018-06-13 Created: 2018-06-13 Last updated: 2018-06-18Bibliographically approved
Grund Bäck, L. (2015). Electronic spectra and molar extinction coefficient of Cu2+ in mixed alkali-alkaline earth-silica glasses. Physics and Chemistry of Glasses-European Journal of Glass Science and Technology Part B, 56(1), 8-14
Open this publication in new window or tab >>Electronic spectra and molar extinction coefficient of Cu2+ in mixed alkali-alkaline earth-silica glasses
2015 (English)In: Physics and Chemistry of Glasses-European Journal of Glass Science and Technology Part B, ISSN 1753-3562, Vol. 56, no 1, p. 8-14Article in journal (Refereed) Published
Abstract [en]

CuO is a very common colorant in blue to turquoise-blue glasses. It is well known that the absorption peak at about 800 nm for silicate glasses is caused by Cu2+, octahedrally coordinated by 6 oxygen ions. It is also known that the [Cu+]/[Cu2+] ratio, the location of the absorption peak and the extinction coefficient of Cu2+ depends on the glass composition. Many investigations have been published with CuO as a colouring agent, but almost none with a mix of Na2O and K2O or CaO and BaO in the base glass. In this study, a base glass composition of 20R2O-10MO-70SiO2 (mol%, R=Na, K and M=Ca, Ba) is used and 0.40 mol% CuO is added. The molar extinction coefficient of Cu2+ is determined for the glasses and peak positions and heights are also presented and discussed.

National Category
Materials Chemistry
Research subject
Technology (byts ev till Engineering), Glass Technology
Identifiers
urn:nbn:se:lnu:diva-45917 (URN)000352247300002 ()2-s2.0-84944036401 (Scopus ID)
Available from: 2015-08-27 Created: 2015-08-27 Last updated: 2017-06-01Bibliographically approved
Grund Bäck, L. (2015). Redox reactions and structure - properties relations in mixed alkali/alkaline earth glasses: - The role of antimony oxides during the fining process- A structural study of copper(I) and copper(II). (Doctoral dissertation). Växjö: Linnaeus University Press
Open this publication in new window or tab >>Redox reactions and structure - properties relations in mixed alkali/alkaline earth glasses: - The role of antimony oxides during the fining process- A structural study of copper(I) and copper(II)
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

It is important to optimize glass compositions for their specific purpose but also for the efficiency of the production process, the manufacturing of glass. This will be beneficial economically and environmentally. Today many processes and glass compositions are already optimized, but due to more strict legislation on toxic elements and substances there must be changes in many glass compositions. One of these elements is antimony; the oxide is used as fining agent to obtain a bubble free glass within a reasonable process time. One aim with this thesis is to obtain a deeper understanding of the fining mechanism in 20R2O-10MO-70SiO2 (R=Na and/or K, M = Ca and/or Ba, Mg, Sr) glasses in order to minimise the amount of Sb2O3. Another intention is to study the structure of 20R2O-10CaO-70SiO2 (R = Na, K) with Cu2+ as probe ion and thus get a deeper knowledge of the surrounding glass matrix.  The optical basicity scale is used to determine the acid/base character of the different glass compositions.

 

Fining efficiency results showed a remarkable increase of the number of remaining bubbles when the glass contains either approximately equal amounts of Na and K or Ca and Ba, Mg or Sr. The much higher number of bubbles in the potassium containing glasses compared to the sodium containing is explained by the increase in viscosity, the increase in optical basicity and thus lower oxygen activity. The differences in the fining efficiency when altering alkaline earth ions cannot be explained by the optical basicity values, it seems to be a more complicated situation.

 

This thesis also reports maximum in Vickers hardness and packing density as well as minimum in glass transition temperature for the mixed alkali glasses. The mixed alkaline earth glasses do not exhibit any clear nonlinear behaviour. Raman spectroscopy measurements showed a variation in the network connectivity which has a clear relation to the optical basicity of the different glass compositions. The combination of UV-Vis-NIR and X-ray absorption spectroscopy measurements showed that the coordination sphere for Cu(II) is a tetragonal distorted octahedron with two elongated Cu-O bonds along the z axis. There were no trends in the degree of tetragonal distortion, thus it was about the same for all the investigated glass compositions. Cu(I) is found to be coordinated by two oxygen ligands in mainly linear coordination sphere, evidenced from X-ray absorption spectroscopy.

Place, publisher, year, edition, pages
Växjö: Linnaeus University Press, 2015. p. 73
Series
Linnaeus University Dissertations ; 231
Keywords
Fining, oxygen activity, redox reactions, mixed alkali effect, mixed alkali silicate glasses, copper, antimony
National Category
Civil Engineering
Research subject
Technology (byts ev till Engineering), Glass Technology
Identifiers
urn:nbn:se:lnu:diva-46782 (URN)978-91-87925-82-5 (ISBN)
Public defence
2015-11-06, Södrasalen, Universitetsplatsen 1, Växjö, 13:00 (English)
Opponent
Supervisors
Available from: 2015-10-20 Created: 2015-10-19 Last updated: 2018-12-12Bibliographically approved
Grund, L., Ali, S. & Jonson, B. (2014). Optical and Physical Properties of CuO-doped mixed alkali: alkaline earth silica glasses. In: : . Paper presented at ESG Glass Conference. Parma, Italy (Sep 2014).
Open this publication in new window or tab >>Optical and Physical Properties of CuO-doped mixed alkali: alkaline earth silica glasses
2014 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Materials Chemistry
Identifiers
urn:nbn:se:lnu:diva-41771 (URN)
Conference
ESG Glass Conference. Parma, Italy (Sep 2014)
Available from: 2015-04-07 Created: 2015-04-07 Last updated: 2015-05-23Bibliographically approved
Jokela, P., Grund, L. & Sundberg, P. (2011). Color matching software for designers and glass industry: a unique tool used in glass art, design and conservation. Paper presented at Glassac11 Conference in Glass Science in Art and Conservation.
Open this publication in new window or tab >>Color matching software for designers and glass industry: a unique tool used in glass art, design and conservation
2011 (English)Conference paper, Oral presentation only (Refereed)
National Category
Other Engineering and Technologies not elsewhere specified
Research subject
Technology (byts ev till Engineering), Glass Technology
Identifiers
urn:nbn:se:lnu:diva-19359 (URN)
Conference
Glassac11 Conference in Glass Science in Art and Conservation
Projects
Tillämpning av perceptuell representation av färg i glas – ett verktyg för designers och glasindustrin
Available from: 2012-06-01 Created: 2012-06-01 Last updated: 2012-06-15Bibliographically approved
Grund, L. & Jonson, B. (2009). Compositional effect on fining and oxygen activity in mixed alkali silicate glasses. European Journal of Glass Science and Technology. Part A: Glass Technology, 50(1), 62-64
Open this publication in new window or tab >>Compositional effect on fining and oxygen activity in mixed alkali silicate glasses
2009 (English)In: European Journal of Glass Science and Technology. Part A: Glass Technology, ISSN 1753-3546, Vol. 50, no 1, p. 62-64Article in journal (Refereed) Published
Abstract [en]

This study monitors, in situ, how alterations of the glass composition affect the results of fining and the oxygen activity (aO2) of the melt. The number of bubbles in annealed glass samples was determined in order to evaluate the fining efficiency. Electrochemical measurement of aO2 was used to monitor in situ the fining charcteristics and conditions of Na2O-K2O-CaO-SiO2 glasses. The glasses investigated had a constant alkali oxide content, but a varying ratio of Na2O/(Na2O+K2O). The Sb2O3 content was o.2 mole-% and NaNO3 or KNO3 was added as oxidising agent in most of the glasses. The results show that the number of bubbles decreases from approximately 1100 to 200 bubbles/ 100 g glass and that aO2 at 1400 deg C increases from 0.2 to 1.2 bar in the glass melt when increasing the Na2O/(Na2O+K2O) ratio from 0 to 1.

Place, publisher, year, edition, pages
Society of Glass Technology, 2009
Keywords
glass. oxygen activity, fining
National Category
Engineering and Technology
Research subject
Technology (byts ev till Engineering)
Identifiers
urn:nbn:se:vxu:diva-4240 (URN)
Available from: 2009-03-09 Created: 2009-03-09 Last updated: 2017-12-13Bibliographically approved
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