Login for students

Login for employees

Publication detail

Glass to crystal transformation in the ternary BaO-Nb2O5-P2O5 system
Authors: Kalenda Petr | Koudelka Ladislav | Mošner Petr | Montagne Lionel | Revel Bertrand | Trebosc Julien
Year: 2017
Type of publication: článek v odborném periodiku
Name of source: Journal of Molecular Structure
Publisher name: Elsevier Science BV
Place: Amsterdam
Page from-to: 472-477
Titles:
Language Name Abstract Keywords
cze Transformace sklo-krystal v ternárním systému BaO-Nb2O5-P2O5 Studium transformace sklo-krystal bylo provedeno pro dvě ternární sloučeniny z oblasti sklotvornosti systému BaO-Nb2O5-P2O5: Ba3Nb2(PO4)4O2 se 16.66 mol% Nb2O5 (sklo o složení 3BaO.1Nb2O5.2P2O5) a BaNb2P2O11 se 33.33 mol% Nb2O5 (sklo o složení 1BaO.1Nb2O5.1P2O5). Byly porovnány fyzikálně chemické vlastnosti korespondujících skel a krystalů i jejich Ramanova spektra a 31P a 93Nb NMR spektra. 31P MAS NMR spektra ukazují na podobnou koordinaci fosforu ve sklech i v odpovídajících krystalech. Statická 93Nb NMR spektra ukázala na přítomnost deformovaných oktaedrů NbO6 jak ve skle 3BaO.1Nb2O5.2P2O5 tak i v krystalech Ba3Nb2(PO4)4O2, zatímco symetrické oktaedry NbO6 byly identifikovány ve sloučenině BaNb2P2O11. fosfátová skla; krystalizace; NMR spektra; Ramanova spektra; struktura skelduben
eng Glass to crystal transformation in the ternary BaO-Nb2O5-P2O5 system Study of the glass to crystal transformation was realized for two ternary compounds belonging to the glass-forming region of the BaO-Nb2O5-P2O5 system: Ba3Nb2(PO4)(4)O-2 with 16.66 mol% Nb2O5 (glass composition 3BaO center dot 1Nb(2)O(5)center dot 2P(2)O(5)) and BaNb2P2O11 with 33.33 mol% Nb2O5 (glass composition 1BaO center dot 1Nb(2)O(5)center dot 2P(2)O(5)). Physico-chemical properties of the corresponding glasses and crystals were compared, as well as their Raman, P-31 and Nb-93 NMR spectra. The density of polycrystalline samples is higher by 0.24-0.25 g cm(-3) than the density of the corresponding glasses. P-31 MAS NMR spectra show a close similarity of phosphorus environments in glasses and the corresponding crystalline samples. High field (18.8T) NMR and Nb-93 decoupling were necessary to obtain enough resolution on P-31 NMR spectra to separate the 2 different short range environments of phosphorus atoms in Ba3Nb2(PO4)(4)O-2. Static Nb-93 NMR spectra showed the presence of distorted NbO6 octahedra both in the 3BaO center dot 1Nb(2)O(5)center dot 2P(2)O(5) glass and the corresponding Ba3Nb2(PO4)(4)O-2 crystals, while the presence of more symmetric NbO6 octahedra was detected in the BaNb2P2O11 compound, which is in accordance with the crystalline structures. Raman and NMR spectra showed similar short-range structural features in glasses and polycrystalline samples, whereas Raman spectra could detect some differences in the medium-range order of the BaO center dot Nb2O5 center dot P2O5 glass and the corresponding BaNb2P2O11 crystal. Phosphate glasses; Crystallization; NMR spectra; Raman spectra; Glass structure

Departments

Other Parts

Map

en.mapy.cz

Services

Popular Links

© 2023 University of Pardubice, Studentská 95, 532 10 Pardubice 2
Phone: +420 466 036 111, 466 036 112, 466 036 113
Webmaster, RSS
Data box ID: f5vj9hu
Accessibility Statement
CC BY-NC-ND 4.0Creative CommonsAttributionNonCommercialNoDerivatives