Abstrakt

Multicomponent cobalt phosphate–silicate glasses from P2O5–SiO2–K2O–MgO–CaO–Co2O3 system in which molar ratio of P2O5 to SiO2 is 41:6 and cobalt ions are gradually incorporated at the expense of magnesium and calcium ions were prepared via melt-quenched technique. The obtained amorphous solids were subjected to the thermal and spectroscopic studies and density measurements in order to gain information about the structure and physical properties. As DSC, XRD, FTIR and pycnometry techniques were applied, the glass transition temperature, specific heat change, crystallization temperature, density, molar volume, oxygen packing density and associated infrared spectra were collected for each glass. Then, the process of induced crystallization was performed on the selected glass samples. The related glass-crystalline materials were evaluated via XRD method. As a result, crystalline phases associated with crystallization temperature were identified. The alterations in determined parameters, stoichiometry of connected crystalline phases and features of infrared spectra allow to conclude the impact of cobalt ions on structure of analyzed glasses due to the direct dependence of structure, physical and thermal properties. The conducted research constitutes a basis for further analysis of cobalt phosphate–silicate glasses and makes a contribution to the knowledge concerning the phosphate glasses family.