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

Autor(es)

Galleani, Gustavo ^[1] ; Bradtmueller, Henrik ^[2] ; Fares, Hssen ^[3] ; Santagneli, Silvia Helena ^[3] ; Nalin, Marcelo ^[3] ; Eckert, Hellmut ^{[1, 2]}

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Journal of Physical Chemistry C; v. 124, n. 46, p. 25578-25587, NOV 19 2020.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 18/24735-3 - Correlação entre a estrutura e as propriedades investigada por RMN multinuclear no estado sólido em materiais desordenados
• Beneficiário: Silvia Helena Santagneli
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/07793-6 - CEPIV - Centro de Ensino, Pesquisa e Inovação em Vidros
• Beneficiário: Edgar Dutra Zanotto
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 18/03931-9 - Preparação de vidros e vitrocerâmicas de fluorofosfatos dopados com íons terras-raras para potencial uso como detectores de radiação.
• Beneficiário: Gustavo Galleani
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 15/22828-6 - Ultrapassando as fronteiras de fibras ópticas: da fotônica até optogenética e monitoramento de meio ambiente
• Beneficiário: Younes Messaddeq
• Modalidade de apoio: Auxílio à Pesquisa - Programa SPEC