Glass transformation effect of mixed SiO 2 -P 2 O 5 -K 2 O-MgO-CaO-CuO glasses was studied by DSC, XRD, SEM, and Raman spectroscopy methods. The relationship between the parameters characterizing glass transformation effect and an amount of phosphorous and copper forming the glassy structure was discussed. It was shown that an increasing content of phosphorous increased solubility of copper in the structure of the studied glasses which was the result of P-O-Cu bonds formation. Degree of changes of T g , Dc p , and time of relaxation values were higher in glasses with higher content of P 2 O 5 and CuO. The observed relations were explained on the basis of the local atomic interactions in the structure of glass.
Glasses from the SiO2-P2O5-K2O-CaO-MgO-CuO system acting as slow release
fertilizers were synthesized by the melt-quenching technique. Influence of
copper addition on structure of the glasses was evaluated by XRD, SEM, FT-IR
and Raman spectroscopy. Chemical activity of the glasses in 2 wt.% citric
acid solutions was measured by ICP-AES method. It has been found that
increasing content of phosphorous increased solubility of copper in the
structure of the studied glasses which was the result of formation of P-O-Cu
bonds.
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