Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Mixed alkali/alkaline earth-silicate glasses: Physical properties and structure by vibrational spectroscopy
Δημιουργός/Συγγραφέας:	Grund Bäck L. Ali S. Karlsson S. Möncke D. [EL] Καμίτσος, Ευστράτιος Ι.[EN] Kamitsos, Efstratios I. Jonson B.
Εκδότης:	Blackwell Publishing Inc.
Ημερομηνία:	2019
Γλώσσα:	Αγγλικά
ISSN:	2041-1286
DOI:	10.1111/ijag.13101
Περίληψη:	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.
Τίτλος πηγής δημοσίευσης:	International Journal of Applied Glass Science
Τόμος/Κεφάλαιο:	10
Τεύχος:	3
Σελίδες:	349-362
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry [EL] Φασματοσκοπία[EN] Spectroscopy
Λέξεις-Κλειδιά:	glass transition temperature hardness mixed modifier effect Raman spectroscopy and IR spectroscopy silicate glass
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© 2019 The American Ceramic Society and Wiley Periodicals, Inc
Σημειώσεις:	2013‐04343, 20180875; Knowledge Foundation; Marie Curie: GROWTH 291795; VINNOVA: 2015‐04809; Stiftelsen för Kunskaps- och Kompetensutveckling, KKS: 68110029; Crafoordska Stiftelsen SA acknowledges the support from Vinnova (Grant No. 2015‐04809) and Crafoord Foundation (Grant No. 20180875) Furthermore, SK acknowledges the Marie‐Curie Fellowship grant via the VINNMER programme (Vinnova, Grant No. 2013‐04343) co‐ funded by Marie Curie Actions FP7‐PEOPLE‐2011‐COFUND (GROWTH 291795). Financial support from the Knowledge Foundation (Grant No. 68110029).
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο