Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Vibrational spectroscopic and bond valence study of structure and bonding in Al2O3-containing AgI-AgPO3 glasses
Δημιουργός/Συγγραφέας:	[EL] Παλλές, Δημήτρης[EN] Palles, Dimitris Konidakis I. [EL] Βαρσάμης, Χρήστος-Πλάτων Ε.[EN] Varsamis, Christos-Platon E. [EL] Καμίτσος, Ευστράτιος Ι.[EN] Kamitsos, Efstratios I.
Εκδότης:	Royal Society of Chemistry
Ημερομηνία:	2016
Γλώσσα:	Αγγλικά
ISSN:	2046-2069
DOI:	10.1039/c6ra00162a
Περίληψη:	We present a detailed investigation of the effects of synthesis conditions on glasses xAgI-(1 - x)AgPO3 with 0 ≤ x ≤ 0.4. Raman and infrared spectroscopy of glasses synthesized in platinum crucibles showed that their metaphosphate structure remains largely unaffected by increasing the amount of AgI. This result contradicts recent findings on similar glasses synthesized by melting in alumina crucibles, which were found to exhibit a strongly changing phosphate structure with addition of AgI. The glass transition temperature and ionic conduction properties of the latter glasses also show strong deviation from the analogous properties of glasses melted in platinum crucibles, as in this work. To reveal the origin of such effects, glasses with the nominal composition 0.4AgI-0.6AgPO3 were synthesized in alumina crucibles and their structures were compared with glasses prepared in platinum crucibles with composition yAl2O3-(1 - y)[0.4AgI-0.6AgPO3] and y = 0.0, 0.04 and 0.07. Vibrational spectroscopy showed that melting in alumina crucibles, especially in the presence of P2O5, leads to doping the AgI-AgPO3 glass with Al2O3 leached from the crucible. The bond valence approach was employed to assist assigning the new Raman bands that develop when Al2O3 modifies the metaphosphate structure, with an exponential relationship describing the dependence of the P-O stretching frequency on bond strength. Combination of this relationship with bond valence principles allowed us to associate the formation of aluminum-triphosphate species Al2/3Ag3P3O10 with the Raman trends observed for AgI-AgPO3 glasses doped with Al2O3 either intentionally or unintentionally, i.e. when melted in alumina crucibles for long times.
Τίτλος πηγής δημοσίευσης:	RSC Advances
Τόμος/Κεφάλαιο:	6
Τεύχος:	20
Σελίδες:	16697-16710
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry [EL] Φασματοσκοπία[EN] Spectroscopy
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© The Royal Society of Chemistry 2016.
Σημειώσεις:	447963; HPMD-CT-2000-00033; European Commission, EC; General Secretariat for Research and Technology, GSRT Partial support by the Greek General Secretariat for Research and Technology and the European Commission, through the European Social Fund for Regional Development NSRF 2007-2013 action ?Development of Research Centres KRHPIS project 447963 ?New Multifunctional Nanostructured Materials and Devices acknowledged. I. K. acknowledges also support from the NHRF/EC grant HPMD-CT-2000-00033.
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο