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- W1672297078 abstract "Thermal and biochemical activities of glasses from the SiO2-P2O5-K2O-MgO-CaO system modied with the addition of CuO were studied. The glasses can act as slowly dissolving fertilizers, supplying macroelements P, K, Mg, Ca and microelements in a form of copper for plants. Thermal characteristics of the glasses was carried out using the DSC method to determine the effect of copper on the glassy state transfor- mation and crystallization process of glasses. In order to identify the crystalline phases appearing as a result of crystallization, the glass sam- ples were heated isothermally at the temperatures indicated by the DSC measurements, and then subjected to analysis by X-ray diffractome- try (XRD). The chemical activity of the glasses modied with the CuO addition was determined by measuring the solubility of glass samples in the 2 % citric acid solution at the weight ratio of glass to solution of 1:100. The amount of elements released from the glass sample was me- asured by inductively coupled plasma atomic emission spectroscopy (ICP-AES). Incorporation to the glass structure the growing amount of CuO resulted in a decrease in the glass transition temperature. Reduction of the glass transition temperature is explained by the replacement of calcium ions and magnesium ions by copper having more covalent bonds. In the process of crystallization of the analyzed glasses, copper builds in the structure of phosphates crystallizing in a form of Ca19Cu2(PO4)14 phosphate, while only a small proportion of copper crystallizes as silicates of a type of diopside. The studies have shown that the increase in CuO content in the structure of the analyzed glasses causes" @default.
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- W1672297078 date "2011-01-01" @default.
- W1672297078 modified "2023-10-04" @default.
- W1672297078 title "The influence of copper on thermal and biochemical activity of silicate-phosphate glasses" @default.
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