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Mixed alkali/alkaline earth-silicate glasses: Physical properties and structure by vibrational spectroscopy
RISE - Research Institutes of Sweden, Built Environment, Building Technology. (Glass)ORCID iD: 0000-0001-7925-6137
Linnaeus University, Sweden.ORCID iD: 0000-0003-1430-2862
RISE - Research Institutes of Sweden, Built Environment, Building Technology. (Glass)ORCID iD: 0000-0003-2160-6979
Linnaeus University, Sweden.ORCID iD: 0000-0002-4197-5520
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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  de-creases, 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
Wiley Periodicals, Inc , 2019. Vol. 10, no 3, p. 349-362
Keywords [en]
mixed modifier effect, silicate glass, glass transition temperature, hardness, Raman spectroscopy and IR
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-38945DOI: 10.1111/ijag.13101OAI: oai:DiVA.org:ri-38945DiVA, id: diva2:1319866
Conference
This article also appears in: International Congress on Glass 2019 Collection
Funder
Vinnova, 2013-04343EU, FP7, Seventh Framework Programme, 2013-04343; GROWTHAvailable from: 2019-06-03 Created: 2019-06-03 Last updated: 2019-07-01Bibliographically approved

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The full text will be freely available from 2020-06-04 14:58
Available from 2020-06-04 14:58

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Grund Bäck, LinaKarlsson, Stefan

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