Titre :

The structure and properties of xZnO–(67-x)SnO–33P2O5glasses: (II) Diffraction, NMR, and chromatographic studies

Auteur(s) :

Hoppe, Uwe [Auteur]
Saitoh, Akira [Auteur]
Tricot, Grégory [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
Freudenberger, Parker [Auteur]
Hannon, Alex C. [Auteur]
Takebe, Hiromichi [Auteur]
Brow, Richard K. [Auteur]

Titre de la revue :

Journal of Non-Crystalline Solids

Numéro :

492

Pagination :

68-76

Date de publication :

2018-07

Mot(s)-clé(s) :

structure
High performance liquid chromatography
Nuclear magnetic resonance
Phosphate glass
X-ray and neutron diffraction

Discipline(s) HAL :

Chimie/Chimie théorique et/ou physique

Résumé en anglais : [en]

Glasses with nominal molar compositions xZnO–(67-x)SnO–33P2O5were prepared and their structures were determined by31P MAS-NMR spectroscopy, HPLC, and by X-ray and neutron diffraction. Compositional dependent changes in the ...
Lire la suite >Glasses with nominal molar compositions xZnO–(67-x)SnO–33P2O5were prepared and their structures were determined by31P MAS-NMR spectroscopy, HPLC, and by X-ray and neutron diffraction. Compositional dependent changes in the thermal and optical properties described in Part I of this study are attributed to changes in the coordination environments of Sn2+- and Zn2+-ions and their effects on the phosphate anionic network. The31P MAS-NMR and HPLC data reveal broader distributions of P-tetrahedra in glasses with greater ZnO-contents, due to disproportionation reactions of diphosphate anions in the glass melts to form isolated monophosphate anions and larger triphosphate anions, and due to the loss of some phosphate during glass preparation. The diffraction experiments reveal that Zn2+prefers tetrahedral coordination, whereas Sn2+is initially incorporated in isolated, three-coordinated sites that convert to four-coordinated sites with greater ZnO contents. These four-coordinated sites must share corners when incorporated into the glass structure and the transition from glasses dominated by isolated SnO3pyramids to those with subnetworks of (Sn, Zn)O4polyhedra occurs near x = 20, and is reflected by breaks in the composition-property trends. The second break in properties occurs near x = 40, and reflects both the dominance of the ZnO4units in the metal subnetwork, as well an increase in the relative numbers of monophosphate anions in the glass structure.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

CNRS
ENSCL
Université de Lille

Collections :

• Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516

Date de dépôt :

2021-11-16T08:23:38Z
2024-02-23T09:14:11Z