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Mixed alkali/alkaline earth‐silicate glasses: Physical properties and structure by vibrational spectroscopy
Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology. RISE, Sweden.
Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology. (Glass group)
RISE, Sweden.
Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology. National Hellenic Research Foundation, Greece.
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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. Vol. 10, no 3, p. 349-362
Keywords [en]
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: urn:nbn:se:lnu:diva-82150DOI: 10.1111/ijag.13101ISI: 000470786300008Scopus ID: 2-s2.0-85066607499OAI: oai:DiVA.org:lnu-82150DiVA, id: diva2:1306848
Available from: 2019-04-25 Created: 2019-04-25 Last updated: 2019-08-29Bibliographically approved

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Grund Bäck, LinaAli, SharafatMöncke, DorisJonson, Bo

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