Abstract
Glass systems of composition 95%[ xB 2O 3(1− x)Bi 2O 3]5%Fe 2O 3 with different Bi/B nominal ratios (0.07⩽ x⩽0.90) have been investigated by means of Raman and infrared spectroscopy in order to obtain information about the competitive role of B 2O 3 and Bi 2O 3 in the formation of the glass network. The glass samples have been prepared by melting at 1100 °C and rapidly cooling at room temperature. The samples have been further kept at 575 °C for 10 h in order to relax the glasses structure as well as to improve the local order and to develop the new formed crystalline phases. The influence of both Bi 2O 3 and Fe 2O 3 on the vitreous B 2O 3 network as well as the local order changes around bismuth and boron atoms in as prepared and heat-treated samples have been studied. Structural modifications occurring in the heat-treated samples compared to the untreated glasses have been pointed out.
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