Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Structure and properties of alkali and silver sulfophosphate glasses
Δημιουργός/Συγγραφέας:	Thieme A. Möncke D. Limbach R. Fuhrmann S. [EL] Καμίτσος, Ευστράτιος Ι.[EN] Kamitsos, Efstratios I. Wondraczek L.
Εκδότης:	Elsevier
Ημερομηνία:	2015
Γλώσσα:	Αγγλικά
ISSN:	0022-3093
DOI:	10.1016/j.jnoncrysol.2014.11.029
Περίληψη:	Glasses of the composition 24 M2SO4-1 M2O-52 ZnO-23 P2O5 with MLi, Na, K, Rb, Cs, and Ag were prepared by conventional melt-quenching. Variation of the monovalent cation results in distinct changes in the thermo-physical, mechanical, and chemical properties. From Li to Cs, the calorimetric glass transition temperature and the stability against crystallization increase significantly. This trend is contrary to expectations in covalent glasses, but consistent with the behavior of ionic fluoride glasses. However, chemical and mechanical properties are consistent with the trend observed for covalent glasses as hardness and elastic modulus are drastically lowered from Li to Cs glasses. Modifier substitution with the heavier Ag ion has often similar effects as lithium substitution due to their comparably small coordination number (i.e., four) in the studied glasses. Raman- and IR-spectroscopic studies were carried out in order to correlate the variations in the glass properties with variations of the glass structure. Here, sulfate anions show preferential bonding to the monovalent cations while phosphate groups are preferentially linked to zinc-cations. For larger alkali cations the tetrahedral phosphate and sulfate groups show a reduction of symmetry, i.e., deviations from tetrahedral symmetry when acting as bi- or multi-dentate ligands.
Τίτλος πηγής δημοσίευσης:	Journal of Non-Crystalline Solids
Τόμος/Κεφάλαιο:	410
Σελίδες:	142-150
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry [EL] Φασματοσκοπία[EN] Spectroscopy
Λέξεις-Κλειδιά:	Alkali oxides Coordination number Ionic glasses Silver oxides Spectroscopy Structure-property correlation Sulfophosphate
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© 2014 Elsevier B.V. All rights reserved.
Σημειώσεις:	Deutsche Forschungsgemeinschaft, DFG: WO-1220-6/1 Financial support by the German Science Foundation (DFG, grant WO-1220-6/1 ) is gratefully acknowledged. We also would like to thank Dimitri Palles for his help during IR spectroscopy measurements at the National Hellenic Research Foundation in Athens.
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο