Raschke, Gerrit

[["dc.bibliographiccitation.firstpage","681"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","European Journal of Mineralogy"],["dc.bibliographiccitation.lastpage","692"],["dc.bibliographiccitation.volume","19"],["dc.contributor.author","Webb, Sharon L."],["dc.contributor.author","Banaszak, Magdalena"],["dc.contributor.author","Koehler, Ursula"],["dc.contributor.author","Rausch, Svenja"],["dc.contributor.author","Raschke, Gerrit"],["dc.date.accessioned","2018-11-07T10:58:57Z"],["dc.date.available","2018-11-07T10:58:57Z"],["dc.date.issued","2007"],["dc.description.abstract","The viscosity of melts in the Na2O-CaO-Al2O3-SiO2 system follows the same trend as a function of composition as that observed in the Na2O-Al2O3-SiO2 system; in that there is a local maximum in viscosity at the condition Na2O+CaO similar to Al2O3. This is despite the difference in charge of Na+ and Ca2+, the similarity in their radius, and XANES data together with MD calculations from the literature that Ca2+ has an affinity to form NBOs with Si4+ tetrahedra, thus possibly leaving Na+ to act as a charge-balancer for Al3+ in tetrahedral co-ordination. The overall description of melt structure and the general flow mechanism appear to be the same for Na2O-Al2O3-SiO2 and CaO-Al2O3-SiO2 melts as there are no anomalous changes in viscosity (or glass density) which could be associated with a strong preference for Ca2+ to form NBOs; or geometrical difficulties accompanying the need for 2 Al3+ tetrahedra to be charge-balanced by the same Ca2+ in the Al3+-rich composition melts."],["dc.identifier.doi","10.1127/0935-1221/2007/0019-1765"],["dc.identifier.isi","000252000400008"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/50585"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","E Schweizerbartsche Verlags"],["dc.relation.issn","0935-1221"],["dc.title","The viscosity of Na2O-CaO-Al2O3-SiO2 melts"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]