Raman and FTIR spectra of iron phosphate glasses containing cerium

摘要

In the present work, cerium iron phosphate glasses were studied to examine the effect of the CeO_2 composition on the structure of the iron phosphate glasses system. Cerium iron phosphate samples with the compositions, I: xCeO_2(40 - x)Fe_2O_360P_2O _5 and II: xCeO_2(100 - x)(40Fe_2O _360P_2O_5) (x = 0-30 mol%) have been prepared. The structure of glasses has been studied using X-ray diffraction (XRD), Raman spectrum, Fourier transform infrared spectrum (FT-IR) and differential thermal analysis (DTA), especially focusing on the structure dependence on the CeO _2 content. The glass formation occurs at series I; at series II, the crystalline phases are detected in the samples. The Q~1 groups are the predominant structural units in glasses with the cerium-free and 10 mol% CeO_2 content. With increasing CeO_2 content in glass compositions, the POP network get extensively depolymerised, resulting in the systematic conversion of Q1 to Q2 structural units. The Q0 units can be detected in the all glasses compositions. The glass transition temperature (Tg) linearly increase with the addition of CeO_2 content, indicating an increase in thermal stability tendency with increasing CeO_2 content. The change of T_g is consistent with structural modification of glass.