Structural and magnetic properties of steel slag based glass-ceramics

Crystallisation of magnetite in multicomponent glass melts was investigated. Structural features and magnetic properties were tested using X-ray diffraction, scanning electron microscope techniques, vibrating sample magnetometer and Mossbauer spectroscopy at room temperature. The results show that the magnetite phase was detected in the glass-ceramic samples after heat treatment at higher crystallisation temperature (over 900 degrees C). Fe2+ and Fe3+ ions contribute to the formation of magnetite crystal. Various crystal morphologies were observed. Isomer shift values suggest that Fe3+ and Fe2+ are in tetrahedral and octahedral coordination respectively. The saturation magnetisation tends to increase with the crystallisation temperature.