Crystallization of sodium molybdate-phosphate ...
Document type :
Article dans une revue scientifique: Article original
Permalink :
Title :
Crystallization of sodium molybdate-phosphate and tungstate-phosphate glasses
Author(s) :
Koudelka, Ladislav [Auteur]
Kupetska, Oksana [Auteur]
Kalenda, Petr [Auteur]
Mošner, Petr [Auteur]
Montagne, Lionel [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Revel, Bertrand [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Kupetska, Oksana [Auteur]
Kalenda, Petr [Auteur]
Mošner, Petr [Auteur]
Montagne, Lionel [Auteur]

Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Revel, Bertrand [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Journal title :
Journal of Non-Crystalline Solids
Volume number :
500
Pages :
42-48
Publisher :
Elsevier BV
Publication date :
2018-11-15
ISSN :
0022-3093
English keyword(s) :
Phosphate glasses
Crystallization
Raman spectra
NMR spectra
Tungsten oxide
Molybdenum oxide
Crystallization
Raman spectra
NMR spectra
Tungsten oxide
Molybdenum oxide
HAL domain(s) :
Chimie/Chimie inorganique
Chimie/Matériaux
Chimie/Matériaux
English abstract : [en]
Study of the glass to crystal transformation was realized for two glasses with composition 25Na2O.50MoO3.25P2O5 and 25Na2O.50MoO3.25P2O5. During the heat treatment process, 2 crystalline compounds are formed, NaMoO2PO4 and ...
Show more >Study of the glass to crystal transformation was realized for two glasses with composition 25Na2O.50MoO3.25P2O5 and 25Na2O.50MoO3.25P2O5. During the heat treatment process, 2 crystalline compounds are formed, NaMoO2PO4 and NaWO2PO4, respectively. Physico-chemical properties of the corresponding glasses and crystals were compared, as well as their Raman and 31P MAS NMR spectra. DTA studies revealed crystallization peaks at 483°C in the Mo-containing glass and at 624°C in the W-containing glass; melting points of crystalline compounds were determined as 695 ±2°C for NaMoO2PO4 and 875±2°C for NaMoO2PO4. Sodium tungstate-phosphate glass has lower solubility in comparison with the sodium molybdate-phosphate glass. The study of crystallization mechanism showed a prevailing surface nucleation. 31P MAS NMR spectra of the 2 glasses showed the same shape and almost same width, which reflects a similar local environment for P in these glasses. The position of the resonance for W-containing glass at a more negative chemical shift than the Mo-containing one is attributed to the larger electrical field strength of W atoms than Mo atoms. 31P MAS NMR spectra of crystals revealed two resonances at +17 and -0.5 ppm for the Mo glass and at -0.1 and -1.9 ppm for the W glass, reflecting the presence of two different phosphorus short range environments, in agreement with their crystal structure. Raman spectra showed similarity in structural features for Mo and W glasses and isomorphic compounds. Splitting of the dominant Raman bands in the crystal spectra reflects a distortion of MoO6 and WO6 octahedra. Raman spectra also suggested the breaking of Mo-O-Mo and W-O-W linkages during crystallization.Show less >
Show more >Study of the glass to crystal transformation was realized for two glasses with composition 25Na2O.50MoO3.25P2O5 and 25Na2O.50MoO3.25P2O5. During the heat treatment process, 2 crystalline compounds are formed, NaMoO2PO4 and NaWO2PO4, respectively. Physico-chemical properties of the corresponding glasses and crystals were compared, as well as their Raman and 31P MAS NMR spectra. DTA studies revealed crystallization peaks at 483°C in the Mo-containing glass and at 624°C in the W-containing glass; melting points of crystalline compounds were determined as 695 ±2°C for NaMoO2PO4 and 875±2°C for NaMoO2PO4. Sodium tungstate-phosphate glass has lower solubility in comparison with the sodium molybdate-phosphate glass. The study of crystallization mechanism showed a prevailing surface nucleation. 31P MAS NMR spectra of the 2 glasses showed the same shape and almost same width, which reflects a similar local environment for P in these glasses. The position of the resonance for W-containing glass at a more negative chemical shift than the Mo-containing one is attributed to the larger electrical field strength of W atoms than Mo atoms. 31P MAS NMR spectra of crystals revealed two resonances at +17 and -0.5 ppm for the Mo glass and at -0.1 and -1.9 ppm for the W glass, reflecting the presence of two different phosphorus short range environments, in agreement with their crystal structure. Raman spectra showed similarity in structural features for Mo and W glasses and isomorphic compounds. Splitting of the dominant Raman bands in the crystal spectra reflects a distortion of MoO6 and WO6 octahedra. Raman spectra also suggested the breaking of Mo-O-Mo and W-O-W linkages during crystallization.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
Other project(s) or funding source(s) :
project No. 18-01976S of the Grant Agency of the Czech Republic
Chevreul Institute (FR 2638)
Ministère de l’Enseignement Supérieur et de la Recherche
Région Nord Pas-de-Calais
Fonds Européen de Développement des Régions
Chevreul Institute (FR 2638)
Ministère de l’Enseignement Supérieur et de la Recherche
Région Nord Pas-de-Calais
Fonds Européen de Développement des Régions
Collections :
Research team(s) :
RMN et matériaux inorganiques (RM2I)
Submission date :
2019-05-09T09:34:05Z
2019-10-24T14:14:33Z
2022-03-08T10:12:15Z
2023-11-28T16:47:56Z
2023-12-01T09:29:37Z
2023-12-01T09:30:52Z
2023-12-01T09:33:03Z
2023-12-01T09:36:17Z
2023-12-01T09:39:26Z
2023-12-01T10:34:48Z
2023-12-01T10:38:58Z
2019-10-24T14:14:33Z
2022-03-08T10:12:15Z
2023-11-28T16:47:56Z
2023-12-01T09:29:37Z
2023-12-01T09:30:52Z
2023-12-01T09:33:03Z
2023-12-01T09:36:17Z
2023-12-01T09:39:26Z
2023-12-01T10:34:48Z
2023-12-01T10:38:58Z
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