Infrared spectra of iron phosphate glasses with gadolinium oxide
2011
Lai, Yuanming | Liang, Xiaofeng | Yin, Guangfu | Yang, Shiyuan | Wang, Junxia | Zhu, Haixiang | Yu, Hongtao
The structure of xGd₂O₃(40−x)Fe₂O₃60P₂O₅ (0⩽x⩽12mol%) glasses have been investigated using Fourier transform infrared spectroscopy (FT-IR). The X-ray diffraction (XRD) and scanning electron microscope (SEM) for the samples containing 9mol% Gd₂O₃ show the presence of a unique crystalline phase, GdPO₄, embedded in an amorphous matrix. These results suggest that the solubility of gadolinium in these iron phosphate melts is less than 9mol% Gd₂O₃. FTIR data suggest that the replacement of up to 6mol% Fe₂O₃ by Gd₂O₃ in the 40Fe₂O₃60P₂O₅ (mol%) glass does not produce any fundamental change in structure of the phosphate network, which consists of predominantly pyrophosphate groups with a small proportion of metaphosphate and orthophosphate groups. This suggests that Gd is substituted into Fe sites in phosphate network. From all these considerations we can conclude that Gd₂O₃ enters in the structure of studied glasses as a network modifier.
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