Chemical model of binary molybdenum phosphate glasses

The influence of molybdenum on the actual chemical composition of phosphate glasses prepared in the range of the batch compositions from ultraphosphate to pyrophosphate was studied. An analysis of the glasses by XRF, ESR and 31P MAS NMR, supplemented by Raman spectroscopy, showed that the chemical c...

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Bibliographic Details
Published in:Journal of solid state chemistry 2021-11, Vol.303, p.122522, Article 122522
Main Authors: Černošek, Zdeněk, Chládková, Monika, Holubová, Jana
Format: Article
Language:English
Subjects:
31P MAS NMR
Chemical model
Electron spin resonance
Molybdenum phosphate glasses
Raman spectroscopy
Thermal properties
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Summary:The influence of molybdenum on the actual chemical composition of phosphate glasses prepared in the range of the batch compositions from ultraphosphate to pyrophosphate was studied. An analysis of the glasses by XRF, ESR and 31P MAS NMR, supplemented by Raman spectroscopy, showed that the chemical composition of the ultraphosphate glass shifted significantly to the metaphosphate region of divalent cations, leading to very stable glass. The chemical composition of the remaining glasses also shifted towards a lower phosphorus content, i.e., to pyrophosphates, but their chemical composition remained in the area between metaphosphates and pyrophosphates of divalent cation. A chemical model was designed for all the glasses, the main glass-forming compounds were determined and the result was successfully confronted with the compositional dependences of both the glass transition temperature and the coefficient of thermal expansion. The main glass-forming components according to proposed chemical model and their compositional dependencies. Changes in chemical compositions during synthesis from batch to actual composition expressed in mol%. [Display omitted] •The influence of Mo on binary glasses of xMoO3-(100-x)P2O5 system with a compositional range from ultra- to pyrophosphates was studied.•Combined analysis of XRF, ESR and 31P MAS NMR, supplemented by Raman spectroscopy, was used to elucidate the chemical composition.•A chemical model was designed and the main glass-forming compounds were determined.•The proposed model of chemical structures was correlated with the results of thermal analysis.
ISSN:0022-4596
1095-726X
DOI:10.1016/j.jssc.2021.122522