Abstract
Local order changes determined by Fe 2O 3 (0–20 mol%) addition to Bi 2O 3–Ga 2O 3 matrix in glass and vitroceramic samples were investigated by X-ray diffraction (XRD), electron paramagnetic resonance (EPR) and Fourier transform infrared (FTIR) spectroscopies. Glass samples were prepared using the melt-quench technique. The vitroceramic samples were obtained by crystallization, as a result of the heat treatment applied on glass samples. The glass network mainly consists of [BiO 6] octahedral units. After heat treatment induced crystallization, [BiO 3] pyramidal units are predominant in samples. As evidenced by electron spin resonance, the Fe 3+ ions surrounding is characterized by low crystal fields, excepting the vitreous sample with the lowest Fe 2O 3 content, wherein the Fe 3+ ions occupy sites of low symmetry, characterized by high crystal fields.
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