Raman and FTIR spectra of iron phosphate glasses containing cerium

Abstract 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: x CeO 2 (40 −  x )Fe 2 O 3 60P 2 O 5 and II: x CeO 2 (100 −  x )(40Fe 2 O 3 60P 2 O 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 P O P network get extensively depolymerised, resulting in the systematic conversion of Q 1 to Q 2 structural units. The Q 0 units can be detected in the all glasses compositions. The glass transition temperature ( T g ) 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.

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