Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Anion polarizabilities in oxynitride glasses. Establishing a common optical basicity scale
Δημιουργός/Συγγραφέας:	Möncke, Doris Ali, Sharafat Jonson, Bo [EL] Καμίτσος, Ευστράτιος Ι.[EN] Kamitsos, Efstratios I.
Εκδότης:	Royal Society of Chemistry
Ημερομηνία:	2020-05-07
Γλώσσα:	Αγγλικά
DOI:	10.1039/c9cp06930e
Άλλο:	32319995
Περίληψη:	Inspired by the work of John Duffy on optical basicity of oxyfluoride glasses, we apply here the concept of optical basicity to oxynitride systems. While in the original work of Duffy and Ingram the basicity of a medium could be probed by s2 ions like Pb2+, the low energy intrinsic absorption edge of nitride-containing systems does not allow the use of such probe ions. This study uses therefore experimental data on refractive index and density of alkaline earth and rare earth containing silicate oxynitride glasses, prepared by the authors or taken from the literature. In addition, literature reports on experimental or calculated refractive index, density and polarizability data are used to compare pure nitride systems, e.g. bulk or thin film materials that are either crystalline or glassy. We compare simple and complex nitride systems with their oxygen counterparts, by calculating their optical basicity using the chemical composition as well as the established relationship between optical basicity, Λ, and electronic polarizability in oxide systems. Our results on oxynitride systems are in good agreement with Duffy's previous work on oxyfluoride glasses and indicate that the optical basicity varies for the isoelectronic anions in nitrides, oxides and fluorides (N3-:O2-:F-) of a cation Mm+ as follows: Λ(MFm) = 1/2Λ(M2Om) = 1/3Λ(M3Nm). Using this relation for CaO, for which the optical basicity was set as unity by Duffy and Ingram, one has Λ(CaF2) = 0.50, Λ(CaO) = 1.00 and Λ(Ca3N2) = 1.50. The optical basicity of complex nitrides can therefore be calculated by the same method established for oxides using the equivalent fractions and the basicity of the constituent nitrides. The relationship between nitride polarizability αN and basicity Λ(nitride) was found to be linear, with Λ(nitride) = 0.39αN- 0.14 where αN is given in Å3.
Τίτλος πηγής δημοσίευσης:	Physical Chemistry Chemical Physics: PCCP
Τόμος/Κεφάλαιο:	22
Τεύχος:	17
Σελίδες:	9543-9560
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry [EL] Χημική τεχνολογία[EN] Chemical technolgy [EL] Οπτική. Φώς[EN] Optics. Light [EL] Χημεία (Γενικά)[EN] Chemistry (General) [EL] Κρυσταλλογραφία[EN] Crystallography
Λέξεις-Κλειδιά:	Optical basicity Oxynitride glasses Nitride Nitride polarizability John Duffy
Κάτοχος πνευματικών δικαιωμάτων:	Copyright © 2020 Τhe Owner Societies
Ηλεκτρονική διεύθυνση στον εκδότη (link):	https://pubs.rsc.org/en/content/articlelanding/2020/CP/C9CP06930E
Ηλεκτρονική διεύθυνση περιοδικού (link) :	https://pubs.rsc.org/en/journals/journalissues/cp#!recentarticles&adv
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο