Infrared spectra of iron phosphate glasses with gadolinium oxide

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• 作者：Yuanming Lai^a ; Xiaofeng Liang^a ;   ; ^b ; Guangfu Yin^b ; Shiyuan Yang^a ;   ; ^{yshiyang@yeah.net} ; Junxia Wang^a ; Haixiang Zhu^a ; Hongtao Yu^a
• 关键词：Iron phosphate glasses ; Gadolinium oxide ; Infrared spectroscopy
• 刊名：Journal of Molecular Structure
• 出版年：2011
• 出版时间：12 October 2011
• 年：2011
• 卷：1004
• 期：1-3
• 页码：188-192
• 全文大小：837 K

文摘

The structure of xGd₂O₃(40 ?x)Fe₂O₃60P₂O₅ (0 ?x ?12 mol % ) 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 9 mol % 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 9 mol % Gd₂O₃. FTIR data suggest that the replacement of up to 6 mol % 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.