Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	The influence of Be addition on the structure and thermal properties of alkali-silicate glasses
Δημιουργός/Συγγραφέας:	Wójcik N.A. Ali S. Möncke D. Tagiara N.S. [EL] Καμίτσος, Ευστράτιος Ι.[EN] Kamitsos, Efstratios I. Segawa H. Eriksson M. Jonson B.
Εκδότης:	Elsevier B.V.
Ημερομηνία:	2019
Γλώσσα:	Αγγλικά
ISSN:	0022-3093
DOI:	10.1016/j.jnoncrysol.2019.119532
Περίληψη:	Be-Na-(Li)-Si oxide glasses containing up to 15 mol% of BeO were prepared. Their structure was characterized by X-ray powder diffraction and Raman as well as infrared spectroscopic techniques, while their chemical compositions were examined by Inductively Coupled Plasma Optical Emission Spectrometry. All materials were found to be amorphous and contain Al contaminations from minor dissolution of the alumina crucibles. The results of Raman and IR spectroscopies showed that BeO addition to Na-(Li)-Si glass systems resulted in the formation of [BeO4/2]2− tetrahedra which are inserted into the silicate glass network, demonstrating the intermediate glass-forming role of BeO. In parallel, the effective destruction of Si-O-Si bridges was observed by vibrational spectroscopy. The glass transition temperature was studied by Differential Thermal Analysis and found to range from about 431 °C to 551 °C. A significant increase in Tg by 70 °C was found as SiO2 was substituted by up to 15 mol% BeO.
Τίτλος πηγής δημοσίευσης:	Journal of Non-Crystalline Solids
Τόμος/Κεφάλαιο:	521
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry
Λέξεις-Κλειδιά:	Alkali-silicate glasses Beryllium-containing glasses IR spectroscopy Raman spectroscopy Thermal properties
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© 2019 Elsevier B.V.
Σημειώσεις:	20160900; Knowledge Foundation; European Commission, EC; VINNOVA: 2015-04809; Stiftelsen för Kunskaps- och Kompetensutveckling, KKS: 68110029; Crafoordska Stiftelsen; General Secretariat for Research and Technology, GSRT; European Regional Development Fund, FEDER; Stiftelsen Åforsk: 14-457 financial support from the Crafoord Foundation (Grant No: 20160900 ). SA also acknowledges support from the ÅForsk Foundation (Grant No. 14-457 ) and Vinnova (Grant No. 2015-04809 ).
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο