Advanced search
Start date
Betweenand
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

BiF3 Incorporation in Na/Ba Mixed Network Modifier Fluoride-Phosphate Glasses: Structural Studies by Solid-State NMR and Raman Spectroscopies

Full text
Author(s):
Galleani, Gustavo [1] ; Bradtmueller, Henrik [2] ; Fares, Hssen [3] ; Santagneli, Silvia Helena [3] ; Nalin, Marcelo [3] ; Eckert, Hellmut [1, 2]
Total Authors: 6
Affiliation:
[1] Sao Paulo Univ USP, Sao Carlos Inst Phys, BR-13566590 Sao Carlos, SP - Brazil
[2] Westfalische Wilhelms Univ Munster, Inst Phys Chem, D-48149 Munster - Germany
[3] Sao Paulo State Univ UNESP, Inst Chem, BR-14800900 Araraquara, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Journal of Physical Chemistry C; v. 124, n. 46, p. 25578-25587, NOV 19 2020.
Web of Science Citations: 0
Abstract

Bismuth-containing rare-earth codoped fluoride phosphate glasses are promising materials for superbroadband near-infrared (NIR) emission with potential applications in optical amplification. To elucidate their structural organization, this contribution develops a comprehensive multinuclear solid-state single and P-31/F-19 double resonance NMR strategy, applied to glasses in the system (BiF3)(y)(50NaPO(3)-20Ba(PO3)(2)-20NaF-10BaF(2))(100-y) (y = 0, 5, 10, 20, 30, 40). To separately assess the influence of bismuth and fluorine constituents on the network structure, an additional set of ( NaPO3)(50-2x) (Ba(PO3)(2)) (20-x)(NaF)(20+2x)(BaF2)(10+x) (x = 0, 2.5, 5.0, 7.5) glasses was also investigated. Introduction of alkali fluoride ions into phosphate glasses is shown to follow a new network modification scheme involving depolymerization of polyphosphate chains under the formation of F-bonded fluorophosphate units. However, a significant part of the fluoride stays separate, interacting exclusively with metal-ion species. Na-23 MAS and Na-23[P-31] double resonance NMR results are consistent with a local sodium ion environment dominated by phosphate ions in the Bi-free system, whereas in the BiF3-containing glasses, the successive reduction of the dipolar second moment M-2(Na-P) with increasing BiF3 content reflects the expected dilution effect, accompanied by increasing competition of the fluoride ions for ligation with the Na+ ions. (AU)

FAPESP's process: 18/24735-3 - The correlation between structure and properties as investigated by multinuclear solid state NMR in disordered materials
Grantee:Silvia Helena Santagneli
Support type: Regular Research Grants
FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
Grantee:Edgar Dutra Zanotto
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 18/03931-9 - Preparation of fluoride-phosphate glass and glass-ceramics doped with rare-earth ions for potential use as radiation detectors
Grantee:Gustavo Galleani
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 15/22828-6 - Pushing the boundaries of optical fibers: from photonics to optogenetics and environmental monitoring
Grantee:Younes Messaddeq
Support type: Research Projects - SPEC Program