期刊
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
卷 116, 期 1, 页码 51-59出版社
SPRINGER
DOI: 10.1007/s10973-014-3705-7
关键词
Silicate-phosphate glasses; CuO; Structure; Crystallization; Chemical activity
资金
- Polish National Science Centre [DEC-2012/05/N/ST8/03568]
The structure of silicate-phosphate glasses from the SiO2-P2O5-K2O-CaO-MgO-CuO system acting as slow release fertilizers, containing different amounts of copper ions replacing magnesium or calcium ions, was examined by DSC, XRD, P-31, and Si-29 MAS-NMR techniques. The chemical activity of the glasses in the 2 mass% citric acid solution was measured by the ICP-AES method. The studies showed that regardless of the kind of replaced components, the Cu ions prefer to associate with the phosphorous Q(1) units, forming the domains composed of orthophosphate with P-O-Cu bonds. The formation of domains with chemically stable P-O-Cu bonds resulted in poorer glass solubility under conditions simulating the natural soil environment.
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