Abstract
The aim of the study was an analysis of two groups of glasses from the SiO2–P2O5–K2O–CaO–MgO system with various content of network formers in the form of P2O5 and SiO2, modified by the addition of ZnO. Their effect on glass-forming ability, glass transition effect, crystallization process and the kind of crystallizing phases was examined using DSC and XRD methods. It was observed that in both matrixes, the addition of ZnO decreases the glass transition temperature (T g). The lower T g values observed in the phosphate matrix glasses and the accompanying higher values of the changes in molar heat capacity (Δc p) in contrast to the silicate matrix glasses may be considered an indicator of the degree of the reconstruction of their amorphous structure, which facilitates the process of their crystallization. It was found that the crystallizing products of the silicate matrix glasses were silicates and phosphates whose structure contained zinc. In the phosphate matrix glasses, it was observed that zinc inhibited the crystallization of silicate phases.
Highlights
Phosphate and silicate glasses containing zinc have been studied intensively, because many of them have been found useful for special applications.Department of Ceramics and Refractories, Faculty of Materials Science and Ceramics, AGH University of Science and Technology, A
The lower Tg values observed in the phosphate matrix glasses and the accompanying higher values of the changes in molar heat capacity (Dcp) in contrast to the silicate matrix glasses may be considered an indicator of the degree of the reconstruction of their amorphous structure, which facilitates the process of their crystallization
The solubility of ZnO in the structure of the glasses from the SiO2–P2O5–K2O–CaO–MgO system in the examined concentration range does not depend on the content of network formers (SiO2, P2O5)
Summary
Phosphate and silicate glasses containing zinc have been studied intensively, because many of them have been found useful for special applications. Because zinc is a trace element that plays an important role in bone formation and mineralization [9, 10], zinc-containing glasses and glass ceramics have been developed for bone engineering applications [11,12,13]. Zinc has been cited as a useful antibacterial agent in glass-ionomer-based cements [14] and ceramic coatings [15]. The addition of zinc to various materials and their use in bone tissue engineering may have important implications for appropriate integration into implant sites with minimal bone infection risk, a complication often associated with the repair of skeletal defects
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