Mixed alkali/alkaline earth‐silicate glasses: Physical properties and structure by vibrational spectroscopy

Grund Bäck, Lina,1974-Linnéuniversitetet,Institutionen för byggd miljö och energiteknik (BET),RISE, Sweden,Byggteknik,Glass (author)

Mixed alkali/alkaline earth‐silicate glasses : Physical properties and structure by vibrational spectroscopy

Funding: Vinnova 2013-04343. EU, FP7, Sjunde ramprogrammet GROWTH
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.

Ali, Sharafat,Associate Professor,1976-Linnéuniversitetet,Institutionen för byggd miljö och energiteknik (BET),Avancerade material,Glass group,Linnaeus University, Sweden(Swepub:lnu)salkem (author)
Karlsson, StefanRISE,Byggteknik,Glass,RISE, Sweden(Swepub:ri)stefan.karlsson@ri.se (author)
Möncke, DorisLinnéuniversitetet,Institutionen för byggd miljö och energiteknik (BET),National Hellenic Research Foundation, Greece,Linnaeus University, Sweden(Swepub:lnu)domoaa (author)
Kamitsos, EfstratiosNational Hellenic Research Foundation, Greece (author)
Jonson, Bo,1958-Linnéuniversitetet,Institutionen för byggd miljö och energiteknik (BET),Avancerade material,Glass group,Linnaeus University, Sweden(Swepub:lnu)bjokem (author)
LinnéuniversitetetInstitutionen för byggd miljö och energiteknik (BET) (creator_code:org_t)

In:International Journal of Applied Glass Science: American Ceramic Society10:3, s. 349-3622041-12862041-1294

By the author/editor: Grund Bäck, Lina ...; Ali, Sharafat, A ...; Karlsson, Stefan; Möncke, Doris; Kamitsos, Efstra ...; Jonson, Bo, 1958 ...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Ceramics

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Other Materials ...

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