Abstract
xFe 2O 3·(100 − x)[Bi 2O 3·CdO] system with 0 ≤ x ≤ 50 mol% was prepared and investigated by X-ray diffraction, density, FT-IR and Raman spectroscopies. The XRD patterns confirm the formation of a vitreous structure for x < 35 mol% Fe 2O 3. The evolution of density and molar volume with the addition and increasing of iron content indicates structural changes in the structure of Bi 2O 3·CdO glass matrix. The FT-IR spectrum of the glass matrix reveals a structure realized from BiO 3 pyramidal and BiO 6 octahedral units. With the addition of iron the structure proposed by the glass matrix is changing by the appearance of FeO 4 units. Also the existence of FeO 6 units cannot be excluded. The Raman spectra suggest a structure build from BiO 6 octahedral units. By Raman scattering the presence of structural units characteristic to Fe 2O 3 was not directly observed but the evolution of the spectra is dependent of the iron content.
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