Abstract
The glass with the molar composition 88SiO2–2Li2O–10Fe2O3 (mole %) was prepared by the sol-gel route and after heat-treated at temperatures between 250 and 1000°C under oxidizing conditions. Crystalline phases (LiFe5O8, SiO2, Fe2O3 and LiFe(Si2O6)) were observed by X-ray powder diffraction in the glasses treated at temperatures above 800°C. Scanning electron micrographs reveal the presence of particles in the samples heat-treated up to 800°C, which are essentially amorphous or with an incipient crystallization. The increase of the heat-treatment temperature promotes the coarsening of particles.The magnetic characteristics of the prepared glasses and glass ceramics were performed using a vibrating sample magnetometer in function of the magnetic field amplitude (−10T≤B≤10T) and in function of temperature (5K–300K). The samples heat-treated at 900 and 1000°C present a ferrimagnetic behavior accompanied by the appearance of peaks corresponding to the lithium ferrite phase (LiFe5O8). A curious aspect is the saturation magnetization of the sample heat-treated at 800°C is the highest of all samples, indicating the highest amount of LiFe5O8 crystals. The Mossbauer results are in accordance with the magnetization and magnetic susceptibility measurements.
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