Asperomagnetism and speromagnetism in magnetic aluminosilicate glasses

In this research, we make use of mineral waste composite with elemental composition of Si, Al, Ca, Mg, K and Fe to synthesize magnetic aluminosilicate glasses (MAGlass). The produced MAGlass presented interesting magnetic and optical properties due to the presence of iron with different valence states. The elemental composition was measured by X-ray fluorescence spectroscopy. X-ray diffraction analysis confirmed the glass amorphous nature. Thermal properties such as glass transition temperature and thermal stability were analyzed by differential scanning calorimetry. The nature of the glass chemical bond structure was studied by FT-Raman analysis. UV–Vis spectroscopy studied the transmittance and absorbance in each sample, approaching the main electronic transitions, Racah parameters and gap energy. Mössbauer and magnetization measurements showed different iron valency states and interesting asperomagnetism and speromagnetism behaviors, with variations among the Fe^2＋ and Fe${}^{2.5+}$ in the MAGlass samples.