Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Electrical properties of Na2O-CaO-P2O5 glasses doped with SiO2 and Si3N4
Δημιουργός/Συγγραφέας:	Wójcik N.A. Jonson B. Barczyński R.J. Kupracz P. Möncke D. Ali S.
Εκδότης:	Elsevier B.V.
Ημερομηνία:	2018
Γλώσσα:	Αγγλικά
ISSN:	0167-2738
DOI:	10.1016/j.ssi.2018.08.011
Περίληψη:	Sodium-calcium-phosphate glasses doped with SiO2 or Si3N4 having similar sodium ion concentrations were prepared by melt quenching. The conductivity was measured by impedance spectroscopy under nitrogen atmosphere in a wide frequency range (10 mHz–1 MHz) and wide temperature range (153–473 K). At 36.6 °C, DC conductivities of all glasses vary between 1.1 ∗ 10−12 and 8.9 ∗ 10−12 S cm−1 and have similar activation energies (between 0.87 and 0.91 eV), which are characteristic for an ionic conduction mechanism. The analysis of AC conductivities showed that the spectra are governed by one dynamic process – hopping of the mobile charge carriers - which may be described i.e., by the ‘concept of mismatch and relaxation’ or by the ‘random barrier’ model. The obtained results confirmed a higher influence of nitrogen incorporation on the various glass conductivity parameters than shown for silicon doping alone. However, the influence of fundamental structural changes on the glass conductivity is less relevant as is the overall sodium ion concentration, which remains the decisive factor for a high ion conduction.
Τίτλος πηγής δημοσίευσης:	Solid State Ionics
Τόμος/Κεφάλαιο:	325
Σελίδες:	157-162
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry [EL] Φασματοσκοπία[EN] Spectroscopy
Λέξεις-Κλειδιά:	Impedance spectroscopy Oxynitride glass Sodium-calcium-phosphate glasses
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© 2018 Elsevier B.V.
Σημειώσεις:	Knowledge Foundation; VINNOVA: 2015-04809; Crafoordska Stiftelsen: 20160900; Linnéuniversitetet: 68110029; Stiftelsen Åforsk: 14-457
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο