Structural studies of copper-containing multicomponent glasses from the SiO2–P2O5–K2O–CaO–MgO system

Multicomponent glasses from the SiO2–P2O5–K2O–MgO–CaO–CuO system acting as slow release fertilizers were synthesized by the melt-quenching technique. The influence of CuO and P2O5 addition on the structure of glasses was evaluated by FTIR, Raman, 31P, and 29Si MAS NMR spectroscopies. The studies sho...

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Bibliographic Details
Published in:Vibrational spectroscopy 2013-03, Vol.65, p.44-49
Main Authors: Sułowska, Justyna, Wacławska, Irena, Olejniczak, Zbigniew
Format: Article
Language:English
Subjects:
29Si MAS NMR
31P MAS NMR
CuO
Degree of polymerization
Displacement
Fertilizers
Forming
FTIR
Glass
NMR spectroscopy
Raman spectroscopy
Silicate–phosphate glasses
Silicon dioxide
Spectroscopy
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Summary:Multicomponent glasses from the SiO2–P2O5–K2O–MgO–CaO–CuO system acting as slow release fertilizers were synthesized by the melt-quenching technique. The influence of CuO and P2O5 addition on the structure of glasses was evaluated by FTIR, Raman, 31P, and 29Si MAS NMR spectroscopies. The studies showed that the Cu2+ ions displacing Ca2+ ions and Mg2+ ions in the structure of glass prefer to associate with the phosphorus Q1 species, forming the Q0 species with chemically stable POCu bonds. This is accompanied by the reduction of the degree of polymerization of the phospho-oxygen sub-network, with a simultaneous increased degree of polymerization of the silico-oxygen sub-network of the silicate–phosphate glasses.
ISSN:0924-2031
1873-3697
DOI:10.1016/j.vibspec.2012.11.013