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In this research, first of all, two samples of glasses of 40SiO₂–28.6B₂O₃–24.5Fe₂O₃– 6.4Na₂O–0.5Cr₂O₃ (mol%) ('A' sample) and 36SiO₂–10.3B₂O₃–17Fe₂O₃–36Na₂O–0.7Cr₂O₃ (mol%) ('B' sample) were synthesized using melting furnace method. Structural and magnetic properties of the samples have been studied by the X-ray diffraction (XRD) and the vibrating sample magnetometer (VSM) respectively. X-ray diffraction pattern of the 'A' sample showed formation of magnetite phase and for the 'B' sample showed amorphous phase. VSM showed ferrimagnetic properties for the 'A' sample, and superparamagnetic properties for the 'B' sample. Crystallization temperature of the 'B' sample obtained at 720°C using the differential thermal analysis (DTA) This glass sample heat treated at 720­°C and 860­°C for one hour in air atmosphere and they called 'B₁' and 'B₂' respectively. The XRD pattern of the 'B₁' sample showed formation of maghemite and hematite phase. Magnetic hysteresis loop showed saturation magnetization (M_s) about 13.5 emu g^-1 for the 'B₁' sample. For the 'B₂' sample, formation of hematite phase and Fe_21.34O₃₂ was observed using XRD data. The remanence magnetization (M_r) obtained about 0.03 emu g^-1 for the 'B₂' sample. Fourier transform infrared spectroscopy (FTIR) showed absorption peaks of Fe-O link in 571
cm^-1 and 435 cm^-1 for the 'B₁' sample and 510 cm^-1 and 461 cm^-1 for the 'B₂' sample.
 

Keywords: Hematite, Magnetic Glass Ceramics, Magnetite, Maghemite, Melting Method

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